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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

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