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Pension Plans and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer contributions | $ 567 | $ 552 | $ 520
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 27 | 78 | 25
Multiemployer plans, plan contributions | 20 | 19 | 19
Benefit obligation | 4,740 | 6,009 | 6,462
Net periodic benefit cost | $ (173) | (186) | (218)
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 | $ 62 | 60 | 54
Benefit obligation | 159 | 207 |
Net periodic benefit cost | $ 4 | $ 4 | $ 12

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