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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 9,707 $ 11,577
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 7,451 6,975
Net amount of derivative assets after application of master netting agreements and cash collateral 182 175
Net amount of derivative liabilities after application of master netting agreements and cash collateral 20 25
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 9,587 11,438
Gross estimated fair value of derivative liabilities 7,159 6,628
Gross estimated fair value of derivative assets (4,261) (4,579)
Gross estimated fair value of derivative liabilities (4,261) (4,579)
Cash collateral on derivative assets (3,934) (5,432)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (1,241) (1,322)
Securities collateral on derivative liabilities (2,879) (2,024)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 108 121
Gross estimated fair value of derivative liabilities 287 342
Gross estimated fair value of derivative assets (9) (33)
Gross estimated fair value of derivative liabilities (9) (33)
Cash collateral on derivative assets (79) (35)
Cash collateral on derivative liabilities (273) (295)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (5) (14)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 12 18
Gross estimated fair value of derivative liabilities 5 5
Gross estimated fair value of derivative assets (1) (1)
Gross estimated fair value of derivative liabilities (1) (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (2) (3)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (1) $ (1)