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Assets Subject to Netting (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Derivatives [Abstract]    
Gross amounts of recognized assets [1] $ 3,169 $ 3,563
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2,626) (2,669)
Cash collateral (429) (760)
Securities collateral (15) (88)
Net amount 99 46
Securities borrowed [Abstract]    
Gross amounts of recognized assets 115 103
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (17) (19)
Securities collateral (95) (82)
Net amount 3 2
Total [Abstract]    
Gross amounts of recognized assets 3,284 3,666
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2,643) (2,688)
Cash collateral (429) (760)
Securities collateral (110) (170)
Net amount 102 48
OTC [Member]    
Derivatives [Abstract]    
Gross amounts of recognized assets 3,093 3,520
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2,606) (2,653)
Cash collateral (428) (760)
Securities collateral (15) (88)
Net amount 44 19
OTC cleared [Member]    
Derivatives [Abstract]    
Gross amounts of recognized assets 25 [3] 21
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (18) [3] (15)
Net amount 7 [3] 6
Exchange-traded [Member]    
Derivatives [Abstract]    
Gross amounts of recognized assets 51 22
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2) (1)
Cash collateral (1)  
Net amount $ 48 $ 21
[1] The fair value of freestanding derivative assets is included in Other assets on the Consolidated Balance Sheets.
[2] Represents the amount of assets that could be offset by liabilities with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.
[3] .