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Borrowings - Long-Term Debt, Debt Issued (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Long-term Debt Instrument      
Notes Issued      
Aggregate amount of debt issued     $ 20,000
U.S dollar. fixed and/or floating rate notes      
Notes Issued      
Aggregate amount of debt issued   $ 4,000 20,000
Euro fixed-rate notes      
Notes Issued      
Aggregate amount of debt issued   4,100 $ 5,700
Fixed rate debt due in 2021      
Notes Issued      
Outstanding debt redeemed   $ 2,900  
Loss upon redemption on notes $ (49)