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Derivative Instruments and Hedging Activities - Effect of Cash Flow Hedge Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (loss) recognized in OCI $ (15) $ 0 $ (15) $ 0
Gain (loss) reclassified from AOCI to interest revenue (17) $ 0 (17) $ 0
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (loss) recognized in OCI (15)   (15)  
Gain (loss) reclassified from AOCI to interest revenue $ (17)   $ (17)