Pension and Other Postretirement Benefits (Details 4) - Pension Plans - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
United Kingdom
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 357	$ 345	$ 360
United Kingdom \| Defined Benefit Plan, Cash [Member]
Pension and Other Postretirement Benefits
Fair value of plan assets		2
United Kingdom \| Pooled Target Return Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		14
United Kingdom \| Fixed income: Pooled UK government index-linked securities
Pension and Other Postretirement Benefits
Fair value of plan assets		78
United Kingdom \| Fixed income: Pooled fixed income funds
Pension and Other Postretirement Benefits
Fair value of plan assets		124
United Kingdom \| Liability-driven investment funds
Pension and Other Postretirement Benefits
Fair value of plan assets		52
United Kingdom \| Pooled Diversified Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		31
United Kingdom \| Cash and Cash Funds
Pension and Other Postretirement Benefits
Fair value of plan assets	4
United Kingdom \| Pooled Property Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		43
United Kingdom \| Receivable From Redemption
Pension and Other Postretirement Benefits
Fair value of plan assets		1
United Kingdom \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	352
United Kingdom \| 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	356	301
United Kingdom \| Quoted Prices in Active Markets (Level 1) \| Defined Benefit Plan, Assets Before Receivables, Net
Pension and Other Postretirement Benefits
Fair value of plan assets	3	1
United Kingdom \| Quoted Prices in Active Markets (Level 1) \| Defined Benefit Plan, Cash [Member]
Pension and Other Postretirement Benefits
Fair value of plan assets		1
United Kingdom \| Quoted Prices in Active Markets (Level 1) \| Pooled Target Return Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| 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 \| 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 \| Quoted Prices in Active Markets (Level 1) \| Liability-driven investment funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| Quoted Prices in Active Markets (Level 1) \| Pooled Diversified Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| Quoted Prices in Active Markets (Level 1) \| Cash and Cash Funds
Pension and Other Postretirement Benefits
Fair value of plan assets	3
United Kingdom \| Quoted Prices in Active Markets (Level 1) \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	0
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Defined Benefit Plan, Assets Before Receivables, Net
Pension and Other Postretirement Benefits
Fair value of plan assets	1	300
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Defined Benefit Plan, Cash [Member]
Pension and Other Postretirement Benefits
Fair value of plan assets		1
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Pooled Target Return Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		14
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Fixed income: Pooled UK government index-linked securities
Pension and Other Postretirement Benefits
Fair value of plan assets		78
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Fixed income: Pooled fixed income funds
Pension and Other Postretirement Benefits
Fair value of plan assets		124
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Liability-driven investment funds
Pension and Other Postretirement Benefits
Fair value of plan assets		52
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Pooled Diversified Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		31
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Cash and Cash Funds
Pension and Other Postretirement Benefits
Fair value of plan assets	1
United Kingdom \| Significant Other Observable Inputs (Level 2) \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Defined Benefit Plan, Assets Before Receivables, Net
Pension and Other Postretirement Benefits
Fair value of plan assets	352	0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Defined Benefit Plan, Cash [Member]
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Pooled Target Return Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| 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 \| Significant Unobservable Inputs (Level 3) \| Fixed income: Pooled fixed income funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Liability-driven investment funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Pooled Diversified Funds
Pension and Other Postretirement Benefits
Fair value of plan assets		0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Cash and Cash Funds
Pension and Other Postretirement Benefits
Fair value of plan assets	0
United Kingdom \| Significant Unobservable Inputs (Level 3) \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	352
United Kingdom \| Fair Value Measured at Net Asset Value Per Share
Pension and Other Postretirement Benefits
Fair value of plan assets	1	344
North America
Pension and Other Postretirement Benefits
Fair value of plan assets	273	299	$ 313
North America \| Cash and cash equivalents
Pension and Other Postretirement Benefits
Fair value of plan assets	99	2
North America \| Short-Term Investments
Pension and Other Postretirement Benefits
Fair value of plan assets	25
North America \| Equity mutual funds: Index equity
Pension and Other Postretirement Benefits
Fair value of plan assets		41
North America \| Fixed income: Other
Pension and Other Postretirement Benefits
Fair value of plan assets	4	10
North America \| Fixed income: Government and agency securities
Pension and Other Postretirement Benefits
Fair value of plan assets	2	90
North America \| Fixed income: Corporate bonds and notes
Pension and Other Postretirement Benefits
Fair value of plan assets	35	100
North America \| Fixed income: U.S.Treasury bonds and notes
Pension and Other Postretirement Benefits
Fair value of plan assets	12	14
North America \| Fixed income mutual funds
Pension and Other Postretirement Benefits
Fair value of plan assets	33	42
North America \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	63
North America \| 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	273	299
North America \| Quoted Prices in Active Markets (Level 1) \| Defined Benefit Plan, Assets Before Receivables, Net
Pension and Other Postretirement Benefits
Fair value of plan assets	45	98
North America \| Quoted Prices in Active Markets (Level 1) \| Cash and cash equivalents
Pension and Other Postretirement Benefits
Fair value of plan assets	0	1
North America \| Quoted Prices in Active Markets (Level 1) \| Short-Term Investments
Pension and Other Postretirement Benefits
Fair value of plan assets	0
North America \| Quoted Prices in Active Markets (Level 1) \| Equity mutual funds: Index equity
Pension and Other Postretirement Benefits
Fair value of plan assets		41
North America \| Quoted Prices in Active Markets (Level 1) \| Fixed income: Other
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
North America \| 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 \| 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 \| 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	12	14
North America \| Quoted Prices in Active Markets (Level 1) \| Fixed income mutual funds
Pension and Other Postretirement Benefits
Fair value of plan assets	33	42
North America \| Quoted Prices in Active Markets (Level 1) \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	0
North America \| Significant Other Observable Inputs (Level 2) \| Defined Benefit Plan, Assets Before Receivables, Net
Pension and Other Postretirement Benefits
Fair value of plan assets	165	201
North America \| Significant Other Observable Inputs (Level 2) \| Cash and cash equivalents
Pension and Other Postretirement Benefits
Fair value of plan assets	99	1
North America \| Significant Other Observable Inputs (Level 2) \| Short-Term Investments
Pension and Other Postretirement Benefits
Fair value of plan assets	25
North America \| Significant Other Observable Inputs (Level 2) \| Equity mutual funds: Index equity
Pension and Other Postretirement Benefits
Fair value of plan assets		0
North America \| Significant Other Observable Inputs (Level 2) \| Fixed income: Other
Pension and Other Postretirement Benefits
Fair value of plan assets	4	10
North America \| Significant Other Observable Inputs (Level 2) \| Fixed income: Government and agency securities
Pension and Other Postretirement Benefits
Fair value of plan assets	2	90
North America \| Significant Other Observable Inputs (Level 2) \| Fixed income: Corporate bonds and notes
Pension and Other Postretirement Benefits
Fair value of plan assets	35	100
North America \| 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 \| Significant Other Observable Inputs (Level 2) \| Fixed income mutual funds
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
North America \| Significant Other Observable Inputs (Level 2) \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	0
North America \| Significant Unobservable Inputs (Level 3) \| Defined Benefit Plan, Assets Before Receivables, Net
Pension and Other Postretirement Benefits
Fair value of plan assets	63	0
North America \| Significant Unobservable Inputs (Level 3) \| Cash and cash equivalents
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
North America \| Significant Unobservable Inputs (Level 3) \| Short-Term Investments
Pension and Other Postretirement Benefits
Fair value of plan assets	0
North America \| Significant Unobservable Inputs (Level 3) \| Equity mutual funds: Index equity
Pension and Other Postretirement Benefits
Fair value of plan assets		0
North America \| Significant Unobservable Inputs (Level 3) \| Fixed income: Other
Pension and Other Postretirement Benefits
Fair value of plan assets	0	0
North America \| 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 \| 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 \| 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 \| Significant Unobservable Inputs (Level 3) \| Fixed income mutual funds
Pension and Other Postretirement Benefits
Fair value of plan assets	0	$ 0
North America \| Significant Unobservable Inputs (Level 3) \| Buy-In Annuity Contracts
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 63