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Income Taxes - Income Tax Contingency (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Income Tax Contingency [Line Items]      
Deferred tax liability, undistributed foreign earnings $ 32    
Undistributed earnings of foreign subsidiaries 1,400    
Liability For Uncertain Tax Positions [Abstract]      
Tax 291 $ 361 $ 399
Interest 117 103 79
Penalties 3 4 18
Reduction of receivables (71) (72)  
Net of tax attributes (1) (2)  
Total 339 394  
Unrecognized Tax Benefits [Roll Forward]      
Balance at beginning of fiscal year 361 399 422
Gross increases related to prior year tax positions 37 14 31
Gross decreases related to prior year tax positions (54) (55) (17)
Gross increases related to current year tax positions 15 8 8
Gross decreases related to current year tax positions (12) 0 0
Settlements and statute of limitation expirations (55) (5) (43)
Foreign exchange and others (1) 0 (2)
Balance at end of fiscal year 291 361 399
Liability for uncertain tax positions that if recognized would affect the effective tax rate 336 365 368
Interest Accrued Related to Uncertain Tax Positions and Penalties [Abstract]      
Increase (decrease) in interest expense 14 24 3
Tax expense on interest 11 18 1
Changes in accrued expense for penalties 0 (14) (2)
Liability recognized for accrued interest 117 103 79
Liability recognized for accrued interest, tax 89 79 61
Liability recognized for accrued penalties 3 $ 4 $ 18
Federal      
Income Tax Contingency [Line Items]      
Interest deduction carryforwards with no expiration 25    
State      
Income Tax Contingency [Line Items]      
Interest deduction carryforwards with no expiration $ 1,230