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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 6,140 $ 3,288
Accumulated Amortization (1,920) (1,824)
Net Carrying Amount $ 4,220 1,464
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 10 years  
Gross Carrying Amount $ 1,510 1,475
Accumulated Amortization (690) (650)
Net Carrying Amount $ 820 825
Service agreements    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 23 years  
Gross Carrying Amount $ 3,262 1,116
Accumulated Amortization (759) (728)
Net Carrying Amount $ 2,503 388
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 20 years  
Gross Carrying Amount $ 570 378
Accumulated Amortization (284) (278)
Net Carrying Amount $ 286 100
Provider Networks    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 22 years  
Gross Carrying Amount $ 360 0
Accumulated Amortization (8) 0
Net Carrying Amount $ 352 0
Technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 9 years  
Gross Carrying Amount $ 311 288
Accumulated Amortization (150) (141)
Net Carrying Amount $ 161 147
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 22 years  
Gross Carrying Amount $ 127 31
Accumulated Amortization (29) (27)
Net Carrying Amount $ 98 $ 4