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Schedule of Resale Agreements (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Securities Purchased under Agreements to Resell [Abstract]    
Federal Funds Sold $ 7 $ 42
Securities Borrowed 492 394
Securities Purchased under Agreements to Resell 752 1,243
Federal Funds Sold and Securities Purchased under Agreements to Resell $ 1,251 $ 1,679