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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 10,726 $ 9,068
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 3,284 3,871
Net amount of derivative assets after application of master netting agreements and cash collateral 243 352
Net amount of derivative liabilities after application of master netting agreements and cash collateral 39 69
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 10,134 8,805
Gross estimated fair value of derivative liabilities 3,224 3,758
Gross estimated fair value of derivative assets (2,453) (2,570)
Gross estimated fair value of derivative liabilities (2,453) (2,570)
Cash collateral on derivative assets (4,476) (4,709)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (3,002) (1,266)
Securities collateral on derivative liabilities (738) (1,134)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 588 245
Gross estimated fair value of derivative liabilities 32 33
Gross estimated fair value of derivative assets (12) (25)
Gross estimated fair value of derivative liabilities (12) (25)
Cash collateral on derivative assets (540) (145)
Cash collateral on derivative liabilities (4) 0
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (10) (8)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 4 18
Gross estimated fair value of derivative liabilities 28 80
Gross estimated fair value of derivative assets 0 (1)
Gross estimated fair value of derivative liabilities 0 (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (15) (57)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (13) $ (7)