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Other Short-Term Borrowings (Components of Other Short-Term Borrowings) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Short Term Debt    
FHLB advances $ 3,500 $ 0
Derivative collateral 447 542
Securities sold under repurchase agreements 595 469
Total other short-term borrowings $ 4,542 $ 1,011