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Schedule of Resale Agreements (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Securities Purchased under Agreements to Resell [Abstract]    
Federal Funds Sold $ 46 $ 65
Securities Borrowed 429 298
Securities Purchased under Agreements to Resell 899 1,175
Federal Funds Sold and Securities Purchased under Agreements to Resell $ 1,374 $ 1,538