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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, 2025
Dec. 31, 2024
Offsetting Assets [Line Items]    
Estimated fair value of derivative assets presented in the consolidated balance sheets $ 8,750 $ 8,370
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 6,845 7,272
Net amount of derivative assets after application of master netting agreements and cash collateral 225 53
Net amount of derivative liabilities after application of master netting agreements and cash collateral 6 9
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 8,527 8,224
Gross estimated fair value of derivative liabilities 6,425 6,966
Gross estimated fair value of derivative assets (3,280) (3,633)
Gross estimated fair value of derivative liabilities (3,280) (3,633)
Cash collateral on derivative assets (2,522) (2,597)
Cash collateral on derivative liabilities 0 0
Securities collateral on derivative assets (2,554) (1,955)
Securities collateral on derivative liabilities (3,139) (3,325)
Cleared [Member]    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 181 135
Gross estimated fair value of derivative liabilities 406 299
Gross estimated fair value of derivative assets (18) (5)
Gross estimated fair value of derivative liabilities (18) (5)
Cash collateral on derivative assets (141) (126)
Cash collateral on derivative liabilities (380) (289)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities (8) (4)
Exchange-traded    
Offsetting Assets [Line Items]    
Gross estimated fair value of derivative assets 42 11
Gross estimated fair value of derivative liabilities 14 7
Gross estimated fair value of derivative assets (10) (1)
Gross estimated fair value of derivative liabilities (10) (1)
Cash collateral on derivative assets 0 0
Cash collateral on derivative liabilities (3) (6)
Securities collateral on derivative assets 0 0
Securities collateral on derivative liabilities $ (1) $ 0