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Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ (1,694) $ (1,599) $ (1,490)
Other comprehensive income (loss), net of tax 187 (51) 24
Ending balance (1,777) (1,694) (1,599)
Reclassification to income statement, tax expense   11  
Derivatives designated for hedge accounting: | Net Investment Hedging | Cross-currency swaps      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Gains (losses) related to net investment hedges (142) 80 3
Derivatives designated for hedge accounting: | Cash Flow Hedging | Cross-currency swaps      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive Income (Loss), cash flow hedge, gain (loss), before reclassification, net of tax   (4) 39
Derivatives designated for hedge accounting: | Cash Flow Hedging | Foreign currency forwards      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive Income (Loss), cash flow hedge, gain (loss), before reclassification, net of tax (21) (6)  
Derivatives designated for hedge accounting: | Cash Flow Hedging | Fixed interest rate swaps      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive Income (Loss), cash flow hedge, gain (loss), before reclassification, net of tax     14
Total Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (932) (881) (905)
Other comprehensive income (loss) before reclassifications (7) (176) 26
Amounts reclassified to earnings and other 194 125 (2)
Other comprehensive income (loss), net of tax 187 (51)  
Ending balance (745) (932) (881)
Other comprehensive income (loss)     24
Foreign Currency Translation Adjustments, Net of Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (989) (856) (847)
Other comprehensive income (loss) before reclassifications 122 (214) (9)
Amounts reclassified to earnings and other 159 81 0
Other comprehensive income (loss), net of tax 281 (133)  
Ending balance (708) (989) (856)
Other comprehensive income (loss)     (9)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 47 (12) (14)
Other comprehensive income (loss) before reclassifications (105) 59 2
Amounts reclassified to earnings and other 0 0 0
Other comprehensive income (loss), net of tax (105) 59  
Ending balance (58) 47 (12)
Other comprehensive income (loss)     2
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Net Investment Hedging      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification, tax benefit (expense) 37 (21) (1)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Cash Flow Hedging      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Other comprehensive income (loss) before reclassification, tax benefit (expense) (3) 3 (14)
Unrealized Gains (Losses) on Cash Flow and Other Hedges, Net of Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (4) 3 (36)
Other comprehensive income (loss) before reclassifications (21) (5) 39
Amounts reclassified to earnings and other 30 (2) 0
Other comprehensive income (loss), net of tax 9 (7)  
Ending balance 5 (4) 3
Other comprehensive income (loss)     39
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 14 (16) (8)
Other comprehensive income (loss) before reclassifications (3) (16) (6)
Amounts reclassified to earnings and other 5 46 (2)
Other comprehensive income (loss), net of tax 2 30  
Ending balance $ 16 $ 14 (16)
Other comprehensive income (loss)     $ (8)