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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets $ 9,466 $ 8,850
Gross estimated fair value of derivative liabilities 5,633 6,549
Amounts offset in the consolidated balance sheet, Assets 0 0
Amounts offset in the consolidated balance sheet, Liabilities 0 0
Estimated fair value of derivative assets presented in the consolidated balance sheets 9,466 8,850
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 5,633 6,549
Net amount of derivative assets after application of master netting agreements and cash collateral 168 139
Net amount of derivative liabilities after application of master netting agreements and cash collateral 172 269
Over the Counter [Member]
   
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 9,151 8,537
Gross estimated fair value of derivative liabilities 5,281 6,367
Gross estimated fair value of derivative assets (4,134) (4,631)
Gross estimated fair value of derivative liabilities (4,134) (4,631)
Cash collateral on derivative assets (1,960) (1,679)
Cash collateral on derivative liabilities (4) (3)
Securities collateral on derivative assets (2,891) (2,105)
Securities collateral on derivative liabilities (971) (1,464)
Cleared [Member]
   
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 310 302
Gross estimated fair value of derivative liabilities 335 129
Gross estimated fair value of derivative assets (195) (122)
Gross estimated fair value of derivative liabilities (195) (122)
Cash collateral on derivative assets (115) (169)
Cash collateral on derivative liabilities (140) (7)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities 0 0
Exchange Traded [Member]
   
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 5 11
Gross estimated fair value of derivative liabilities 17 53
Gross estimated fair value of derivative assets (3) (5)
Gross estimated fair value of derivative liabilities (3) (5)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (13) (44)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (1) $ (4)