Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Jurisdiction
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Estimated impact on net income (loss)     $ 2,900,000,000
Provisional income tax expense (benefit)     2,300,000,000
Provisional investment valuation adjustment     (946,000,000)
Provisional income tax expense (benefit), investments     (347,000,000)
Estimated incremental income tax expense     1,900,000,000
Unrecognized tax benefits that would impact effective rate $ 814,000,000 $ 1,600,000,000 1,200,000,000
Decrease in unrecognized tax benefits, reasonably possible 64,000,000    
Penalties and interest expense (benefit) (19,000,000) 43,000,000 1,000,000
Penalties and interest accrued $ 147,000,000 218,000,000  
Number of jurisdictions for filing income tax returns (more than) | Jurisdiction 100    
Provisional undistributed accumulated earnings of foreign subsidiary $ 5,000,000,000.0    
Provisional unrecognized deferred tax liability 1,000,000,000.0    
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), tax expense (benefit) 1,860,000,000 $ (1,190,000,000) $ (1,229,000,000)
Net operating losses – non-U.S.      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Operating loss carryforwards, valuation allowance 423,000,000    
United Kingdom | Net operating losses – non-U.S.      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Operating loss carryforwards, valuation allowance $ 0