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Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
 3 Months Ended
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (1,777,000,000) $ (1,694,000,000)
Other comprehensive income (loss) (4,000,000) 34,000,000
Ending balance (3,864,000,000) (1,588,000,000)
Gains (losses) related to cash flow hedges 0 0
Derivatives designated for hedge accounting | Net Investment Hedging | Currency swap    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Gains related to net investment hedges 81,000,000 (233,000,000)
Derivatives designated for hedge accounting | Cash Flow Hedges | Currency swap    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Gains (losses) related to cash flow hedges 7,000,000  
Derivatives designated as cash flow and other hedges 7,000,000 5,000,000
Derivatives designated for hedge accounting | Cash Flow Hedges | Interest rate swap locks, Foreign currency forwards and Other    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Derivatives designated as cash flow and other hedges 0 14,000,000
Total Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (745,000,000) (932,000,000)
Other comprehensive income (loss) (4,000,000) 34,000,000
Ending balance (749,000,000) (898,000,000)
Foreign Currency Translation Adjustments, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (708,000,000) (989,000,000)
Other comprehensive income (loss) (69,000,000) 193,000,000
Ending balance (777,000,000) (796,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (58,000,000) 47,000,000
Other comprehensive income (loss) 60,000,000 (172,000,000)
Ending balance 2,000,000 (125,000,000)
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) (21,000,000) 61,000,000
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income (loss) before reclassification, tax benefit (expense) (2,000,000) (5,000,000)
Unrealized Gains on Cash Flow and Other Hedges, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 5,000,000 (4,000,000)
Other comprehensive income (loss) 5,000,000 14,000,000
Ending balance 10,000,000 10,000,000
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 16,000,000 14,000,000
Other comprehensive income (loss) 0 (1,000,000)
Ending balance $ 16,000,000 $ 13,000,000