v3.26.1
Income Taxes (Reconciliation of Statutory Tax Rates) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Nontaxable or nondeductible items        
Other   $ (2)    
Other Adjustments   1 $ (3) $ 5
Prior year adjustments     (7) (18)
Nontaxable dividends   (1)    
Income tax provision   $ 1 $ 159 $ 218
Percent        
Canada Statutory Tax Rate 25.00%      
Nontaxable or nondeductible items        
Other   (11.00%)    
Other Adjustments   6.00%    
Nontaxable dividends   (6.00%)    
Effective Income Tax Rate Reconciliation, Percent   6.00% 19.00% 27.00%
Canada        
Amount        
Canada Statutory Tax Rate   $ 5    
State and Local Income Taxes, net   2    
Tax credits        
Foreign tax credits   (18)    
Valuation Allowance   (72)    
Nontaxable or nondeductible items        
Imputed income   7    
Changes in unrecognized tax benefits   11    
Income tax provision   $ (75) $ (74)  
Percent        
Canada Statutory Tax Rate   25.00%    
State and Local Income Taxes, net   11.00%    
Tax credits        
Foreign tax credits   (100.00%)    
Valuation Allowance   (400.00%)    
Nontaxable or nondeductible items        
Imputed income   39.00%    
Changes in unrecognized tax benefits   62.00%    
United States        
Amount        
State and Local Income Taxes, net   $ (23)    
Nontaxable or nondeductible items        
Imputed income   2    
Tax rate differential   31    
Tax credits   (9)    
Prior year adjustments   $ (2)    
Percent        
State and Local Income Taxes, net   (128.00%)    
Nontaxable or nondeductible items        
Imputed income   11.00%    
Tax rate differential   172.00%    
Tax credits   (50.00%)    
Prior year adjustments   (11.00%)    
Brazil        
Nontaxable or nondeductible items        
Imputed income   $ (6)    
Tax rate differential   25    
Tax credits   (3)    
Foreign exchange translation and remeasurement   12    
Withholding tax expense   $ 29    
Income tax provision     (13)  
Nontaxable or nondeductible items        
Imputed income   (33.00%)    
Tax rate differential   139.00%    
Tax credits   (17.00%)    
Foreign exchange translation and remeasurement   68.00%    
Withholding tax expense   161.00%    
Germany        
Tax credits        
Valuation Allowance   $ (1)    
Nontaxable or nondeductible items        
Imputed income   2    
Tax rate differential   6    
Prior year adjustments   4    
Legislative changes including enacted tax rates   $ (17)    
Tax credits        
Valuation Allowance   (6.00%)    
Nontaxable or nondeductible items        
Imputed income   11.00%    
Tax rate differential   33.00%    
Prior year adjustments   22.00%    
Legislative changes including enacted tax rates   (94.00%)    
Korea        
Nontaxable or nondeductible items        
Tax rate differential   $ (2)    
Withholding tax expense   9    
Legislative changes including enacted tax rates   $ 2    
Nontaxable or nondeductible items        
Tax rate differential   (11.00%)    
Withholding tax expense   50.00%    
Legislative changes including enacted tax rates   11.00%    
China        
Tax credits        
Valuation Allowance   $ 10    
Nontaxable or nondeductible items        
Imputed income   1    
Withholding tax expense   9    
Income tax provision   $ 10    
Tax credits        
Valuation Allowance   56.00%    
Nontaxable or nondeductible items        
Imputed income   6.00%    
Withholding tax expense   50.00%    
Switzerland        
Nontaxable or nondeductible items        
Tax rate differential   $ (5)    
Nontaxable or nondeductible items        
Tax rate differential   (28.00%)    
Dubai        
Nontaxable or nondeductible items        
Tax rate differential   $ (4)    
Nontaxable or nondeductible items        
Tax rate differential   (22.00%)    
United Kingdom        
Tax credits        
Valuation Allowance   $ (1)    
Nontaxable or nondeductible items        
Tax credits   $ (1)    
Tax credits        
Valuation Allowance   (6.00%)    
Nontaxable or nondeductible items        
Tax credits   (6.00%)    
Italy        
Nontaxable or nondeductible items        
Imputed income   $ 1    
Income tax provision     $ 10  
Nontaxable or nondeductible items        
Imputed income   6.00%    
Hong Kong        
Nontaxable or nondeductible items        
Prior year adjustments   $ 1    
Nontaxable or nondeductible items        
Prior year adjustments   6.00%    
France        
Nontaxable or nondeductible items        
Withholding tax expense   $ 1    
Nontaxable or nondeductible items        
Withholding tax expense   6.00%    
Other Foreign Jurisdictions        
Nontaxable or nondeductible items        
Tax rate differential   $ (3)    
Nontaxable or nondeductible items        
Tax rate differential   (16.00%)