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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Amount $ 6,067 $ 6,129
Accumulated Amortization (2,054) (2,050)
Net Carrying Amount $ 4,013 4,079
Customer relationships    
Intangible Asset, Finite-Lived [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 9 years  
Gross Carrying Amount $ 1,475 1,477
Accumulated Amortization (738) (717)
Net Carrying Amount $ 737 760
Service agreements    
Intangible Asset, Finite-Lived [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 23 years  
Gross Carrying Amount $ 3,181 3,249
Accumulated Amortization (803) (833)
Net Carrying Amount $ 2,378 2,416
Trademarks and trade names    
Intangible Asset, Finite-Lived [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 19 years  
Gross Carrying Amount $ 574 576
Accumulated Amortization (295) (293)
Net Carrying Amount $ 279 283
Provider Networks    
Intangible Asset, Finite-Lived [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 21 years  
Gross Carrying Amount $ 393 383
Accumulated Amortization (20) (15)
Net Carrying Amount $ 373 368
Technology    
Intangible Asset, Finite-Lived [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 8 years  
Gross Carrying Amount $ 317 317
Accumulated Amortization (165) (160)
Net Carrying Amount $ 152 157
Other    
Intangible Asset, Finite-Lived [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 21 years  
Gross Carrying Amount $ 127 127
Accumulated Amortization (33) (32)
Net Carrying Amount $ 94 $ 95