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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, 2021
Dec. 31, 2020
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 10,056 $ 11,958
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 4,807 4,171
Net amount of derivative assets after application of master netting agreements and cash collateral 110 200
Net amount of derivative liabilities after application of master netting agreements and cash collateral 127 108
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 9,611 11,348
Gross estimated fair value of derivative liabilities 4,685 4,111
Gross estimated fair value of derivative assets (2,988) (2,926)
Gross estimated fair value of derivative liabilities (2,988) (2,926)
Cash collateral on derivative assets (5,464) (6,842)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (1,077) (1,453)
Securities collateral on derivative liabilities (1,568) (1,100)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 428 593
Gross estimated fair value of derivative liabilities 103 20
Gross estimated fair value of derivative assets (43) (7)
Gross estimated fair value of derivative liabilities (43) (7)
Cash collateral on derivative assets (373) (530)
Cash collateral on derivative liabilities (28) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (33) (1)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 17 17
Gross estimated fair value of derivative liabilities 19 40
Gross estimated fair value of derivative assets (1) 0
Gross estimated fair value of derivative liabilities (1) 0
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (2) (23)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (17) $ (1)