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Derivative Instruments and Hedging Activities (Derivative Instruments Designated as Fair Value Hedges, Gain (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Interest and fees on finance receivables and loans $ 2,827 $ 2,575
Interest and dividends on investment securities and other earning assets 266 238
Interest on long-term debt 248 227
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
Total (loss) gain on cash flow hedging relationships (1) 5
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
Total (loss) gain on cash flow hedging relationships 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
Total (loss) gain on cash flow hedging relationships 0 0
Total derivatives designated as accounting hedges | Unsecured debt | 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
Change in unrealized gain (loss) on fair value hedging instruments 0 0
Total derivatives designated as accounting hedges | Unsecured debt | 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
Change in unrealized gain (loss) on fair value hedging instruments 0 0
Total derivatives designated as accounting hedges | Unsecured debt | Interest on long-term debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Change in unrealized gain (loss) on hedged item in fair value hedge 0 1
Change in unrealized gain (loss) on fair value hedging instruments 0 (1)
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
Change in unrealized gain (loss) on fair value hedging instruments 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 (205) 130
Change in unrealized gain (loss) on fair value hedging instruments 205 (130)
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
Change in unrealized gain (loss) on fair value hedging instruments 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 (94) 205
Change in unrealized gain (loss) on fair value hedging instruments 94 (205)
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
Change in unrealized gain (loss) on fair value hedging instruments 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
Change in unrealized gain (loss) on fair value hedging instruments 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 (1) 5
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
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