v3.26.1
Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Derivative [Line Items]      
Gain (loss) recognized in AOCI $ 63 $ (17)  
Fair value of assets (liabilities) available for offset 515   $ 520
GM Financial      
Derivative [Line Items]      
Notional 165,734   167,913
Fair Value of Assets 836   1,107
Fair Value of Liabilities 1,127   1,175
Collateral available for netting 585   615
GM Financial | Interest rate swaps | Fair value hedges | Fair Value Level 2 | Designated as Hedges      
Derivative [Line Items]      
Notional 36,367   33,880
Fair Value of Assets 55   88
Fair Value of Liabilities 421   457
GM Financial | Interest rate swaps | Cash flow hedges | Fair Value Level 2 | Designated as Hedges      
Derivative [Line Items]      
Notional 2,486   2,302
Fair Value of Assets 28   18
Fair Value of Liabilities 15   23
GM Financial | Foreign currency swaps | Cash flow hedges | Fair Value Level 2 | Designated as Hedges      
Derivative [Line Items]      
Notional 8,190   9,226
Fair Value of Assets 334   580
Fair Value of Liabilities 109   58
GM Financial | Interest rate contracts | Fair Value Level 2 | Not Designated as Hedges      
Derivative [Line Items]      
Notional 118,692   122,505
Fair Value of Assets 420   421
Fair Value of Liabilities 582   $ 637
GM Financial | Foreign exchange contracts | Cash flow hedges      
Derivative [Line Items]      
Gain (loss) recognized in AOCI $ (163) 157  
(Gains) losses reclassified from AOCI   $ (231)