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Securities Financing Activities - Schedule of securities purchased under resale agreements & securities borrowed collateral netting (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Securities purchased under resale agreements with an appropriate legal opinion    
Net asset balance $ 209,547 $ 204,423
Amounts not nettable on the Consolidated Balance Sheets, Financial instruments (206,423) (201,375)
Amounts not nettable on the Consolidated Balance Sheets, Cash collateral (351) (246)
Net exposure 2,773 2,802
Securities borrowed    
Net asset balance 67,453 75,113
Amounts not nettable on the Consolidated Balance Sheets, Financial instruments (65,081) (72,730)
Amounts not nettable on the Consolidated Balance Sheets, Cash collateral 0 0
Net exposure $ 2,372 $ 2,383