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Income Taxes (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss and capital loss carryforwards, state $ 56 $ 68
Net operating loss and capital loss carryforwards, foreign 49 116
Retirement and other employee benefits 2 14
Foreign tax credits 57 55
State tax credits 11 16
Other 34 38
Operating lease liabilities 66 63
Gross deferred tax assets 275 370
Valuation allowance (107) (194)
Net deferred tax assets 168 176
Deferred tax liabilities:    
Depreciation and amortization (273) (300)
Investments in partnerships (659) (780)
Operating lease right-of-use assets (63) (63)
Undistributed earnings (14) (9)
Other (30) (23)
Deferred tax liabilities (1,039) (1,175)
Net deferred tax liability (871) (999)
Unrecognized tax benefits:    
Balance as of January 1 222 181
Additions for tax positions taken during the current year 1 5
Additions for tax positions taken during prior years 7 69
Reductions related to lapsed statutes of limitations 0 0
Reductions related to settlements with tax jurisdictions 0 (33)
Balance as of December 31 $ 230 $ 222