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Pension and Other Postretirement Benefits (Details 4) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Pooled Property Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] |  | Fair Value Measured at Net Asset Value Per Share [Member] |
Funds measured at NAV |  |  |
Pension and Other Postretirement Benefits |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
United Kingdom | Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 360 | $ 320 | $ 505
Total assets at fair value | 354 | 316 |
Receivable from redemption | 6 | 4 |
United Kingdom | Pension Plans | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 44 |  |
United Kingdom | Pension Plans | Defined Benefit Plan, Cash [Member] |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 26 |
United Kingdom | Pension Plans | Pooled Target Return Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 41 |
United Kingdom | Pension Plans | Fixed income: Pooled UK government index-linked securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 67 |
United Kingdom | Pension Plans | Fixed income: Pooled fixed income funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 47 |
United Kingdom | Pension Plans | Liability-driven investment funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 68 | 30 |
United Kingdom | Pension Plans | Pooled UK Government Securities Funds Index-Linked Securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 54 |  |
United Kingdom | Pension Plans | Pooled Global Debt Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 74 |  |
United Kingdom | Pension Plans | Pooled Diversified Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 54 | 44 |
United Kingdom | Pension Plans | Cash and Cash Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 13 |  |
United Kingdom | Pension Plans | Pooled Property Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 61 |
United Kingdom | Pension Plans | Funds measured at NAV |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 47 |  |
United Kingdom | Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 307 | 255 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 13 | 9 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 |  |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Defined Benefit Plan, Cash [Member] |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 9 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Pooled Target Return Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income: Pooled UK government index-linked securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income: Pooled fixed income funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Liability-driven investment funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Pooled UK Government Securities Funds Index-Linked Securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Pooled Global Debt Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 |  |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Pooled Diversified Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
United Kingdom | Pension Plans | Quoted Prices in Active Markets (Level 1) | Cash and Cash Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 13 |  |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 294 | 246 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 44 |  |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Defined Benefit Plan, Cash [Member] |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 17 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled Target Return Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 41 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income: Pooled UK government index-linked securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 67 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income: Pooled fixed income funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 47 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Liability-driven investment funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 68 | 30 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled UK Government Securities Funds Index-Linked Securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 54 |  |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled Global Debt Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 74 |  |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled Diversified Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 54 | 44 |
United Kingdom | Pension Plans | Significant Other Observable Inputs (Level 2) | Cash and Cash Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 |  |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 |  |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Defined Benefit Plan, Cash [Member] |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled Target Return Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income: Pooled UK government index-linked securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income: Pooled fixed income funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Liability-driven investment funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled UK Government Securities Funds Index-Linked Securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled Global Debt Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 |  |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled Diversified Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
United Kingdom | Pension Plans | Significant Unobservable Inputs (Level 3) | Cash and Cash Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 |  |
North America | Pension Plans |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 313 | 273 | $ 830
North America | Pension Plans | Cash and cash equivalents |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1 | 3 |
North America | Pension Plans | Equity mutual funds: Index equity |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 35 | 28 |
North America | Pension Plans | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 16 | 16 |
North America | Pension Plans | Fixed income: Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 8 | 6 |
North America | Pension Plans | Fixed income: Government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 88 | 81 |
North America | Pension Plans | Fixed income: Corporate bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 101 | 109 |
North America | Pension Plans | Fixed income: U.S.Treasury bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 17 | 14 |
North America | Pension Plans | Fixed income mutual funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 45 | 16 |
North America | Pension Plans | Accruals and payables—net |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | (1) |  |
North America | Pension Plans | Accruals and payables—net |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets |  | 0 |
North America | Pension Plans | Short-Term Investments |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 3 |  |
North America | Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 | Defined Benefit Plan, Assets Before Receivables, Net |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 314 | 273 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Defined Benefit Plan, Assets Before Receivables, Net |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 64 | 44 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Cash and cash equivalents |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 2 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Equity mutual funds: Index equity |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 35 | 28 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income: Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income: Government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income: Corporate bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income: U.S.Treasury bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 17 | 14 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Fixed income mutual funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 11 | 0 |
North America | Pension Plans | Quoted Prices in Active Markets (Level 1) | Short-Term Investments |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1 |  |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Defined Benefit Plan, Assets Before Receivables, Net |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 250 | 229 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 1 | 1 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Equity mutual funds: Index equity |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 16 | 16 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income: Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 8 | 6 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income: Government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 88 | 81 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income: Corporate bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 101 | 109 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income: U.S.Treasury bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Fixed income mutual funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 34 | 16 |
North America | Pension Plans | Significant Other Observable Inputs (Level 2) | Short-Term Investments |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 2 |  |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Defined Benefit Plan, Assets Before Receivables, Net |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Cash and cash equivalents |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Equity mutual funds: Index equity |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Pooled Equity Funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income: Other |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income: Government and agency securities |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income: Corporate bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income: U.S.Treasury bonds and notes |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Fixed income mutual funds |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | 0 | $ 0 |
North America | Pension Plans | Significant Unobservable Inputs (Level 3) | Short-Term Investments |  |  |
Pension and Other Postretirement Benefits |  |  |
Fair value of plan assets | $ 0 |  |

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