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Pension Plans and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions	$ 610	$ 581	$ 567
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	23	24	27
Multiemployer plans, plan contributions	19	19	20
Benefit obligation	4,349	4,736	4,740
Net periodic benefit cost	$ (104)	(94)	(173)
Pension Plan \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	7.00%
Pension Plan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	75.00%
Pension Plan \| Real assets
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	7.00%
Pension Plan \| Private equity limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	5.00%
Pension Plan \| Private credit limited partnerships
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	2.00%
Pension Plan \| Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	4.00%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plans, plan contributions	$ 63	60	62
Benefit obligation	147	155
Net periodic benefit cost	$ 6	$ 6	$ 4