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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Income tax expense (benefit) allocated directly to equity $ (101) $ (13) $ (2)
Unrecognized tax benefits that would impact effective tax rate 213    
Cash outflow from unrecognized tax benefit that would impact effective tax rate 223    
Interest (income) expense recognized related to unrecognized tax benefits 9 0 (1)
Accrued interest related to unrecognized tax benefits $ 24 $ 23 $ 27
Minimum      
Income Taxes [Line Items]      
Statue of limitations on foreign jurisdictions for tax audits 3 years    
Maximum      
Income Taxes [Line Items]      
Statue of limitations on foreign jurisdictions for tax audits 6 years