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Borrowings - Post-Swap Borrowing (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Borrowings    
Fixed-rate debt, Amount $ 52,169 $ 28,770
Floating-rate debt, Amount 9,455 13,886
Total $ 61,624 $ 42,656
Fixed-rate debt, Weighted-average Interest Rate (as a percent) 2.90% 2.70%
Floating-rate debt, Weighted-average Interest Rate (as a percent) 2.20% 3.00%
Interest rate swaps    
Borrowings    
Notional amount $ 2,975 $ 7,563
Interest rate swaps | Derivative instruments in fair value hedges    
Borrowings    
Notional amount $ 3,000 $ 7,600