U.S. defined benefit pension and retiree welfare plans The Company operates a qualified cash balance plan that is open to new members, a closed non-qualified cash balance plan, and a closed retiree welfare plan. Actuarial valuations to determine the Company’s minimum funding contributions for the qualified cash balance plan are required annually. Deficits revealed in the funding valuations must generally be funded over a period of up to seven years. It is expected that there will be no required funding for this plan in 2023. There are no plan assets set aside for the non-qualified cash balance plan. The retiree welfare plan subsidizes the cost of life insurance and medical benefits. The majority of those who retired after 1991 receive a fixed-dollar subsidy from the Company based on service. The plan was closed to all employees hired after 2004. While assets have been set aside in a qualified trust to pay future retiree welfare benefits, this funding is optional. Retiree welfare benefits offered under the plan coordinate with the U.S. Medicare program to make optimal use of available federal financial support. The qualified pension and retiree welfare plans are governed by the U.S. Benefits Committee, while the non-qualified pension plan is governed by the U.S. Non-Qualified Plans Subcommittee. Canadian defined benefit pension and retiree welfare plans The Company’s defined benefit plans in Canada include two registered final average pay pension plans, a non-registered supplemental final average pay pension plan and a retiree welfare plan, all of which have been closed to new members. Actuarial valuations to determine the Company’s minimum funding contributions for the registered pension plans are required at least once every three years. Deficits revealed in the funding valuation must generally be funded over a period of ten years. For 2023, the required funding for these plans is expected to be $3. The non-registered supplemental pension plan is not funded. The retiree welfare plan subsidizes the cost of life insurance, medical and dental benefits. These subsidies are a fixed-dollar amount for those who retired after April 30, 2013 and have been eliminated for those who retire after 2019. There are no assets set aside for this plan. The registered pension plans are governed by Pension Committees, while the supplemental non-registered plan is governed by the Board of Directors. The retiree welfare plan is governed by management. (b) Risks In final average pay pension plans and retiree welfare plans, the Company generally bears the material risks which include interest rate, investment, longevity and health care cost inflation risks. In defined contribution plans, these risks are typically borne by the employee. In cash balance plans, the interest rate, investment and longevity risks are partially transferred to the employee. Material sources of risk to the Company for all plans include: • A decline in discount rates that increases the defined benefit obligations by more than the change in value of plan assets; • Lower than expected rates of mortality; and • For retiree welfare plans, higher than expected health care costs. The Company has managed these risks through plan design and eligibility changes that have limited the size and growth of the defined benefit obligations. Investment risks for funded plans are managed by investing significantly in asset classes which are highly correlated with the plans’ liabilities. In the U.S., delegated committee representatives and management review the financial status of the qualified defined benefit pension plan at least monthly, and steps are taken in accordance with an established dynamic investment policy to increase the plan’s allocation to asset classes which are highly correlated with the plan’s liabilities and reduce investment risk as the funded status improves. As at December 31, 2022, the target asset allocation for the plan was 30% return-seeking assets and 70% liability-hedging assets (2021 - 30% and 70%). In Canada, internal committees and management review the financial status of the registered defined benefit pension plans on at least a quarterly basis. As at December 31, 2022, the target asset allocation for the plans was 20% return-seeking assets and 80% liability- hedging assets (2021 - 20% and 80%). Certain long-term impacts of the COVID-19 pandemic (on future mortality and inflation, for example) are still unknown. The Company will continue to closely monitor experience related to COVID-19, as well as emerging research, and will adjust its long-term assumptions accordingly in the future. 201