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Derivative Instruments and Hedging Activities - Schedule of Derivative Instruments Designated as Fair Value Hedges, Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Interest and fees on finance receivables and loans $ 2,674 $ 2,889 $ 8,007 $ 8,561
Interest and dividends on investment securities and other earning assets 250 262 728 793
Interest on long-term debt 265 256 794 748
Loss on cash flow hedges to be recognized within twelve months     18  
Total derivatives designated as accounting hedges | Interest and fees on finance receivables and loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on fair value hedging relationships 0 0 0 0
Total loss on cash flow hedging relationships (8) (4) (23) (7)
Total derivatives designated as accounting hedges | Interest and dividends on investment securities and other earning assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on fair value hedging relationships 0 0 0 0
Total loss on cash flow hedging relationships 0 0 0 0
Total derivatives designated as accounting hedges | Interest on long-term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain on fair value hedging relationships 0 0 0 0
Total loss on cash flow hedging relationships 0 0 0 0
Total derivatives designated as accounting hedges | Hedged available-for-sale securities | Interest and fees on finance receivables and loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in unrealized gain (loss) on hedged item in fair value hedge 0 0 0 0
Change in unrealized gain (loss) on fair value hedging instruments 0 0 0 0
Total derivatives designated as accounting hedges | Hedged available-for-sale securities | Interest and dividends on investment securities and other earning assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in unrealized gain (loss) on hedged item in fair value hedge 10 327 224 94
Change in unrealized gain (loss) on fair value hedging instruments (10) (327) (224) (94)
Total derivatives designated as accounting hedges | Hedged available-for-sale securities | Interest on long-term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in unrealized gain (loss) on hedged item in fair value hedge 0 0 0 0
Change in unrealized gain (loss) on fair value hedging instruments 0 0 0 0
Total derivatives designated as accounting hedges | Fixed-rate automotive loans | Interest and fees on finance receivables and loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in unrealized gain (loss) on hedged item in fair value hedge 7 190 48 107
Change in unrealized gain (loss) on fair value hedging instruments (7) (190) (48) (107)
Total derivatives designated as accounting hedges | Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in unrealized gain (loss) on hedged item in fair value hedge 0 0 0 0
Change in unrealized gain (loss) on fair value hedging instruments 0 0 0 0
Total derivatives designated as accounting hedges | Fixed-rate automotive loans | Interest on long-term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in unrealized gain (loss) on hedged item in fair value hedge 0 0 0 0
Change in unrealized gain (loss) on fair value hedging instruments 0 0 0 0
Total derivatives designated as accounting hedges | Hedged variable-rate commercial loans | Interest and fees on finance receivables and loans        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate cash flow hedge loss reclassified to earnings (8) (4) (23) (7)
Total derivatives designated as accounting hedges | Hedged variable-rate commercial loans | Interest and dividends on investment securities and other earning assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate cash flow hedge loss reclassified to earnings 0 0 0 0
Total derivatives designated as accounting hedges | Hedged variable-rate commercial loans | Interest on long-term debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate cash flow hedge loss reclassified to earnings $ 0 $ 0 $ 0 $ 0