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Schedule of Resale Agreements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Securities Purchased under Agreements to Resell [Abstract]    
Federal Funds Sold $ 5 $ 42
Securities Borrowed 491 394
Securities Purchased under Agreements to Resell 818 1,243
Federal Funds Sold and Securities Purchased under Agreements to Resell $ 1,314 $ 1,679