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Employee Benefits - Fair Value of Plan Assets and Liabilities (Details) - Combined Pension Plan - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | $ 4,715 | $ 8,531 | $ 10,546 | $ 10,493
Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 5 | 11 | 8 |
NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 2,259 | 2,690 |  |
Investment Grade Bonds | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 99 | 127 |  |
High Yield Bonds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 4 | 6 | 6 |
High Yield Bonds | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 81 | 70 |  |
U.S. Stocks | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1 | 5 | $ 2 |
U.S. Stocks | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 79 | 71 |  |
Non-U.S. Stocks | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 270 | 398 |  |
Emerging Market Stocks | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 15 | 11 |  |
Private Equity | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 326 | 348 |  |
Private Debt | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 438 | 495 |  |
Market Neutral Hedge Funds | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 135 | 141 |  |
Directional Hedge Funds | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 166 | 241 |  |
Real Estate | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 333 | 420 |  |
Multi-Asset Strategies | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 24 | 38 |  |
Cash equivalents and short-term investments | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 293 | 330 |  |
Fair Value, Measurements, Recurring |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 4,715 | 8,531 |  |
Fair Value, Measurements, Recurring | NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 2,259 | 2,690 |  |
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 2,736 | 6,034 |  |
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 883 | 1,555 |  |
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1,848 | 4,468 |  |
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 5 | 11 |  |
Fair Value, Measurements, Recurring | Investment Grade Bonds | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 2,166 | 4,606 |  |
Fair Value, Measurements, Recurring | Investment Grade Bonds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 446 | 862 |  |
Fair Value, Measurements, Recurring | Investment Grade Bonds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1,720 | 3,744 |  |
Fair Value, Measurements, Recurring | Investment Grade Bonds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | High Yield Bonds | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 52 | 178 |  |
Fair Value, Measurements, Recurring | High Yield Bonds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | High Yield Bonds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 48 | 172 |  |
Fair Value, Measurements, Recurring | High Yield Bonds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 4 | 6 |  |
Fair Value, Measurements, Recurring | Emerging Market Bonds | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 127 | 233 |  |
Fair Value, Measurements, Recurring | Emerging Market Bonds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 49 | 64 |  |
Fair Value, Measurements, Recurring | Emerging Market Bonds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 78 | 169 |  |
Fair Value, Measurements, Recurring | Emerging Market Bonds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | U.S. Stocks | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 215 | 338 |  |
Fair Value, Measurements, Recurring | U.S. Stocks | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 214 | 330 |  |
Fair Value, Measurements, Recurring | U.S. Stocks | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 3 |  |
Fair Value, Measurements, Recurring | U.S. Stocks | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1 | 5 |  |
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 150 | 256 |  |
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 149 | 256 |  |
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1 | 0 |  |
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 25 | 41 |  |
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 25 | 41 |  |
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Derivatives | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | (11) | 1 |  |
Fair Value, Measurements, Recurring | Derivatives | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | (1) | 0 |  |
Fair Value, Measurements, Recurring | Derivatives | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | (10) | 1 |  |
Fair Value, Measurements, Recurring | Derivatives | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Cash equivalents and short-term investments | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1 | 381 |  |
Fair Value, Measurements, Recurring | Cash equivalents and short-term investments | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 2 |  |
Fair Value, Measurements, Recurring | Cash equivalents and short-term investments | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1 | 379 |  |
Fair Value, Measurements, Recurring | Cash equivalents and short-term investments | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Repurchase Agreements | Total |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | (269) | (193) |  |
Fair Value, Measurements, Recurring | Repurchase Agreements | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0 | 0 |  |
Fair Value, Measurements, Recurring | Repurchase Agreements | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | (269) | (193) |  |
Fair Value, Measurements, Recurring | Repurchase Agreements | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | $ 0 | $ 0 |  |

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