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Other Short-Term Borrowings (Components of Other Short-Term Borrowings) (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Short Term Debt    
FHLB advances $ 300 $ 0
Securities sold under repurchase agreements 671 302
Derivative collateral 282 271
Other borrowings 76 0
Total other short-term borrowings $ 1,329 $ 573