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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - GM Financial - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Notional $ 157,689 $ 163,446
Fair Value of Assets 1,691 1,809
Fair Value of Liabilities 2,815 2,563
Collateral 447 457
Collateral available for netting 1,200 1,200
Cash Flow Hedges | Foreign currency swaps    
Derivative [Line Items]    
Loss recognized in AOCI 141  
Loss on AOCI reclassification 163  
Not Designated as Hedges | Foreign currency | Fair Value Level 2    
Derivative [Line Items]    
Notional 940 0
Fair Value of Assets 2 0
Fair Value of Liabilities 0 0
Not Designated as Hedges | Interest rate contracts | Fair Value Level 2    
Derivative [Line Items]    
Notional 123,103 134,683
Fair Value of Assets 1,576 1,573
Fair Value of Liabilities 2,024 1,997
Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2    
Derivative [Line Items]    
Notional 21,991 18,379
Fair Value of Assets 9 75
Fair Value of Liabilities 352 238
Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2    
Derivative [Line Items]    
Notional 2,447 2,381
Fair Value of Assets 16 17
Fair Value of Liabilities 10 16
Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2    
Derivative [Line Items]    
Notional 9,208 8,003
Fair Value of Assets 88 144
Fair Value of Liabilities $ 428 $ 311