Pension Plans and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions	$ 581	$ 567	$ 552
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	24	27	78
Multiemployer plans, plan contributions	19	20	19
Benefit obligation	4,736	4,740	6,009
Net periodic benefit cost	$ (94)	(173)	(186)
Pension Plan \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	12.00%
Pension Plan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	77.00%
Pension Plan \| Real estate investment
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	5.00%
Pension Plan \| Private equity investments
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	3.00%
Pension Plan \| Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Target investment allocations	3.00%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plans, plan contributions	$ 60	62	60
Benefit obligation	155	159
Net periodic benefit cost	$ 6	$ 4	$ 4

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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