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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current tax expense - U.S. federal $ 185 $ 64 $ 390
Current tax expense - State and local 17 39 (7)
Current Foreign Tax Expense (Benefit) 1,013 969 620
Total current tax expense 1,215 1,072 1,003
Deferred tax expense (benefit) - U.S. federal 20 85 8
Deferred tax expense (benefit) - State and local 7 0 15
Deferred Foreign Income Tax Expense (Benefit) (395) (388) (209)
Total deferred income taxes (368) (303) (186)
Income Tax Expense (Benefit) $ 847 769 817
Tax (benefit) charge related to the Tax Act     61
2019 Divestitures | Discontinued Operations, Disposed of by Sale      
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current Foreign Tax Expense (Benefit)   48  
Deferred Foreign Income Tax Expense (Benefit)   22  
Income Tax Expense (Benefit)   $ 70  
2018 Divestitures | Discontinued Operations, Disposed of by Sale      
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Current tax expense - U.S. federal     252
Current tax expense - State and local     4
Current Foreign Tax Expense (Benefit)     114
Total current tax expense     371
Deferred tax expense (benefit) - U.S. federal     $ 1