Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.20.4
Income Taxes - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Jurisdiction
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Income Tax Disclosure [Line Items]      
Unrecognized tax benefits that would impact effective rate $ 976,000,000 $ 814,000,000 $ 1,600,000,000
Decrease in unrecognized tax benefits, reasonably possible 166,000,000    
Penalties and interest expense (benefit) 9,000,000 (19,000,000) 43,000,000
Penalties and interest accrued $ 130,000,000 147,000,000  
Number of jurisdictions for filing income tax returns (more than) | Jurisdiction 100    
Retained earnings $ 22,348,000,000 18,679,000,000  
Temporary differences with investments in Non-US subsidiaries 5,000,000,000.0    
Deferred tax liability, temporary differences with investments in Non-US subsidiaries 1,000,000,000.0    
Cumulative Effect, Period of Adoption, Adjustment      
Income Tax Disclosure [Line Items]      
Retained earnings   760,000,000  
Accumulated Other Comprehensive Income (Loss)      
Income Tax Disclosure [Line Items]      
Other comprehensive income (loss), tax expense (benefit) 1,506,000,000 $ 1,860,000,000 $ (1,190,000,000)
Net operating losses – non-U.S.      
Income Tax Disclosure [Line Items]      
Valuation Allowance (441,000,000)    
United Kingdom | Net operating losses – non-U.S.      
Income Tax Disclosure [Line Items]      
Valuation Allowance $ 0