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Income Taxes (Deferred) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income taxes      
Changes in valuation allowance $ (23) $ 79 $ 1,167
Deferred tax assets      
Swiss historic depreciation and financing asset costs 1,210    
Net operating loss carryforwards 1,264    
Interest expense limitation 87    
United Kingdom charter limitation 53    
Accrued expenses 47    
Tax credits 4    
Accrued payroll expenses not currently deductible 16    
Loss contingencies 4    
Other 54    
Valuation allowance (1,884) (1,910)  
Total deferred tax assets, net of allowance 855    
Deferred tax liabilities      
Depreciation (1,342)    
Other (9)    
Total deferred tax liabilities (1,351)    
Deferred tax assets (liabilities), net (496)    
U.S. foreign tax credit carryforwards 4 11  
NOLs that are not subject to expiration dates 585    
NOLs that are subject to expiration dates 855    
Reconciliation of unrecognized tax benefits, excluding interest and penalties      
Balance, beginning of period 444 402 378
Additions for current year tax positions 45 28 28
Additions for prior year tax positions 5 62 46
Reductions related to statute of limitation expirations and changes in law (14) (13) (19)
Reductions due to settlements (5) (5) (31)
Reductions for prior year tax positions (26) (30)  
Balance, end of period 449 444 402
Unrecognized tax benefits      
Unrecognized tax benefits, excluding interest and penalties 449 444 402
Interest and penalties 9 27  
Unrecognized tax benefits, including interest and penalties 458 471  
Interest and penalties related to unrecognized tax benefits recognized as a component of income tax expense (18) 6 $ 8
Unrecognized benefits netted against NOL deferred tax assets 411    
Amount if recognized that would impact tax rate 47    
Swiss TRAF      
Income taxes      
Changes in valuation allowance 1,100 1,100  
Deferred tax assets      
Total deferred tax assets, net of allowance 1,210 1,230  
Deferred tax liabilities      
Total deferred tax liabilities $ (264) $ (226)