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Federal Funds Sold and Securities Financing Activities Netting of Financial Instruments - Repurchase Agreements (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed $ 1,408 $ 1,473
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure [1] 1,408 1,473
Securities Purchased under Agreements to Resell, Fair Value of Collateral 1,394 1,462
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement 14 11
Securities Borrowed or Purchased Under Agreements to Resell, Amount Not Offset Against Collateral 0 0
Securities Sold under Agreements to Repurchase, Gross 1,677 1,503
Securities Sold under Agreements to Repurchase 1,677 1,503
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities 1,677 1,503
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement 0 0
Securities Sold Under Agreements to Repurchase, Amount Not Offset Against Collateral $ 0 $ 0
[1] Excludes $20 million and $65 million of Fed Funds sold, which are not subject to a master netting agreement at March 31, 2018 and December 31, 2017, respectively.