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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, 2023
Dec. 31, 2022
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 10,208 $ 11,577
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 6,233 6,975
Net amount of derivative assets after application of master netting agreements and cash collateral 168 175
Net amount of derivative liabilities after application of master netting agreements and cash collateral 46 25
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 10,067 11,438
Gross estimated fair value of derivative liabilities 6,120 6,628
Gross estimated fair value of derivative assets (3,880) (4,579)
Gross estimated fair value of derivative liabilities (3,880) (4,579)
Cash collateral on derivative assets (4,050) (5,432)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (2,006) (1,322)
Securities collateral on derivative liabilities (2,194) (2,024)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 129 121
Gross estimated fair value of derivative liabilities 86 342
Gross estimated fair value of derivative assets (8) (33)
Gross estimated fair value of derivative liabilities (8) (33)
Cash collateral on derivative assets (92) (35)
Cash collateral on derivative liabilities (78) (295)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities 0 (14)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 12 18
Gross estimated fair value of derivative liabilities 27 5
Gross estimated fair value of derivative assets (4) (1)
Gross estimated fair value of derivative liabilities (4) (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (11) (3)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (12) $ (1)