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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 19,031 $ 10,195
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 4,883 3,716
Net amount of derivative assets after application of master netting agreements and cash collateral 700 93
Net amount of derivative liabilities after application of master netting agreements and cash collateral 38 25
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 17,682 9,574
Gross estimated fair value of derivative liabilities 4,247 3,624
Gross estimated fair value of derivative assets (3,329) (2,664)
Gross estimated fair value of derivative liabilities (3,329) (2,664)
Cash collateral on derivative assets (11,556) (5,317)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (2,563) (1,521)
Securities collateral on derivative liabilities (881) (935)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 1,315 606
Gross estimated fair value of derivative liabilities 612 81
Gross estimated fair value of derivative assets (410) (38)
Gross estimated fair value of derivative liabilities (410) (38)
Cash collateral on derivative assets (471) (560)
Cash collateral on derivative liabilities (38) (4)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (164) (39)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 34 15
Gross estimated fair value of derivative liabilities 24 11
Gross estimated fair value of derivative assets (2) (2)
Gross estimated fair value of derivative liabilities (2) (2)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (13) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (8) $ (4)