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Offsetting Assets and Liabilities (Assets Subject to Netting) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivatives: [Abstract]    
Derivative Asset, Fair Value, Gross Asset [1] $ 3,563 $ 3,446
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2,669) (2,725)
Cash collateral (760) (409)
Securities collateral (88) (235)
Net amount 46 77
Securities borrowed [Abstract]    
Gross amounts of recognized assets 103 127
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (19) (16)
Securities collateral (82) (108)
Net amount 2 3
Total [Abstract]    
Gross amounts of recognized assets 3,666 3,573
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2,688) (2,741)
Cash collateral (760) (409)
Securities collateral (170) (343)
Net amount 48 80
OTC [Member]    
Derivatives: [Abstract]    
Derivative Asset, Fair Value, Gross Asset 3,520 2,920
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (2,653) (2,214)
Cash collateral (760) (406)
Securities collateral (88) (235)
Net amount 19 65
OTC cleared [Member]    
Derivatives: [Abstract]    
Derivative Asset, Fair Value, Gross Asset 21 512
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (15) (509)
Cash collateral   (3)
Net amount 6  
Exchange-traded [Member]    
Derivatives: [Abstract]    
Derivative Asset, Fair Value, Gross Asset 22 14
Gross amounts not offset in the consolidated balance sheets [Abstract]    
Financial instruments [2] (1) (2)
Net amount $ 21 $ 12
[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.