Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended				12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Oct. 31, 2021	Jul. 31, 2023	Jun. 30, 2023	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Change in accrued other postretirement benefits liability				$ 10
Settlements									$ 5	$ 58	$ 75
Average duration for plans' projected cash flows (in years)									10 years
Period expected long-term rate of return is applied (in years)									5 years
Expected long-term rate of return on plan assets									6.70%	6.70%	6.20%
Number of years over actual annual healthcare cost trend experience									20 years
Health care cost trend rate assumed for next year		5.50%				5.50%			5.50%	5.50%	5.50%
Defined benefit plan, ultimate health care cost trend rate		4.50%				4.50%			4.50%	4.50%	4.50%
Pension contributions									$ 36	$ 43	$ 96
Contribution next fiscal year									52
Expenses related to defined contribution plan									$ 82	76	66
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, ultimate health care cost trend rate									(0.40%)
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, ultimate health care cost trend rate									11.30%
United States
Defined Benefit Plan Disclosure [Line Items]
Pension contributions									$ 36	43
Contribution next fiscal year									45
United States | Scenario, forecast
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets								7.00%
Pension benefits paid
Defined Benefit Plan Disclosure [Line Items]
Restructuring and other (credits) charges						$ 34
Increase (decrease) in obligation, pension benefits			$ 125
Settlements					$ 3				5	58	69
Pension benefits paid | United States
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in obligation, pension benefits	$ 19
Settlements										41
Pension benefits paid | Canada
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in obligation, pension benefits		$ 2
Pension benefits paid | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Settlements											23
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in obligation, pension benefits							$ 39
Settlements									$ 0	0	0
Number of years over actual annual healthcare cost trend experience									3 years
Pension Settlement Cost
Defined Benefit Plan Disclosure [Line Items]
Restructuring and other (credits) charges									$ 2	$ 17	$ 12