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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, 2024
Dec. 31, 2023
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 8,319 $ 8,918
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 6,304 6,307
Net amount of derivative assets after application of master netting agreements and cash collateral 106 183
Net amount of derivative liabilities after application of master netting agreements and cash collateral 8 19
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 8,111 8,749
Gross estimated fair value of derivative liabilities 6,036 6,014
Gross estimated fair value of derivative assets (3,035) (3,568)
Gross estimated fair value of derivative liabilities (3,035) (3,568)
Cash collateral on derivative assets (2,676) (3,448)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (2,313) (1,563)
Securities collateral on derivative liabilities (2,993) (2,427)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 191 158
Gross estimated fair value of derivative liabilities 260 277
Gross estimated fair value of derivative assets (5) (5)
Gross estimated fair value of derivative liabilities (5) (5)
Cash collateral on derivative assets (181) (150)
Cash collateral on derivative liabilities (237) (239)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (18) (33)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 17 11
Gross estimated fair value of derivative liabilities 8 16
Gross estimated fair value of derivative assets (3) (1)
Gross estimated fair value of derivative liabilities (3) (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (4) (5)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (1) $ (10)