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Derivative Instruments - Impact on Statements of Income, Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Unrealized gains/(losses) on investment securities        
Gains/(losses) recorded in income and other comprehensive income/(loss)        
Pre-tax gains (losses) reclassified related to liquidation of legal entity $ 0   $ 0  
Other Income | Unrealized gains/(losses) on investment securities        
Gains/(losses) recorded in income and other comprehensive income/(loss)        
Pre-tax gains (losses) reclassified related to liquidation of legal entity   $ (8)   $ (8)
Net Investment Hedging | Foreign exchange        
Gains/(losses) recorded in income and other comprehensive income/(loss)        
Amounts recorded in income (79) (81) (107) (71)
Amounts recorded in OCI $ (270) $ (413) $ 930 $ 1,176