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Derivative Instruments and Hedging Activities - Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged liability, fair value hedge $ 4,411 $ 5,987
Hedged Liability, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt
Available-for-sale securities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, fair value hedge $ 15,418 $ 15,194
Hedged asset, fair value hedge, cumulative increase (decrease) $ 19 $ (248)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Available-for-sale securities (amortized cost of $25,660 and $26,810) Available-for-sale securities (amortized cost of $25,660 and $26,810)
Closed portfolio and beneficial interest, last-of-layer, amortized cost $ 13,900 $ 13,900
Amortized cost 13,600 13,600
Cumulative basis adjustment for active hedges, asset (liability) 2 (209)
Hedged asset, last-of-layer, amount 11,500 12,000
Available-for-sale securities | Total derivatives designated as accounting hedges    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Cumulative basis adjustment for active hedges, asset (liability) 93 (106)
Finance receivables and loans, net    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, fair value hedge 31,980 34,493
Hedged asset, fair value hedge, cumulative increase (decrease) $ 0 $ (51)
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Finance receivables and loans, net Finance receivables and loans, net
Cumulative basis adjustment for active hedges, asset (liability)   $ (51)
Hedged asset, last-of-layer, amount $ 14,300 20,100
Closed portfolio, carrying value 24,800 33,400
Finance receivables and loans, net | Total derivatives designated as accounting hedges    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Cumulative basis adjustment for active hedges, asset (liability) (2) (41)
Long-term debt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged liability, fair value hedge, cumulative increase (decrease) 81 88
Discontinued hedge | Available-for-sale securities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) (91) (132)
Cumulative basis adjustment for active hedges, asset (liability) (91) (103)
Discontinued hedge | Finance receivables and loans, net    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) 2 (10)
Cumulative basis adjustment for active hedges, asset (liability) 2 (10)
Discontinued hedge | Long-term debt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged liability, discontinued fair value hedge, cumulative increase (decrease) $ 81 $ 88