v3.26.1
Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance $ 9,397 $ 8,993 $ 8,993
Aggregate adjustment for the period (1) (77) 163  
Balance 9,423 9,159 9,397
Accumulated other comprehensive loss (Note 13) (719) (1,011) (641)
Designated as Hedging Instrument | Net Investment Hedging      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Gain (loss) on net investment hedge, net of tax 30    
Foreign currency translation adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (741) (1,036) (1,036)
Aggregate adjustment for the period (1) (66) 101  
Balance (807) (935) (741)
Foreign currency translation adjustments | TTTech Auto AG      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Aggregate adjustment for the period (1)     (6)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax (4) (11)  
Net tax effect of Reclassification Adjustment from AOCI on Derivatives 6 (3)  
Pension and postretirement plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (15) (13) (13)
Other comprehensive income (loss) before reclassifications (net of tax effect) (1) 0  
Balance (16) (13) (15)
Net tax effect of Other comprehensive income before reclassifications 0 0  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance 0 (4) (4)
Other comprehensive income (loss) before reclassifications (net of tax effect) 1 0  
Balance 1 (4) 0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment and Tax 0 0  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance 115 (121) (121)
Other comprehensive income (loss) before reclassifications (net of tax effect) 24 61  
Reclassification to income (net of tax effect) (36) 1  
Balance $ 103 $ (59) $ 115