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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 6,129 $ 3,288
Accumulated Amortization (2,050) (1,824)
Net Carrying Amount $ 4,079 1,464
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 10 years  
Gross Carrying Amount $ 1,477 1,475
Accumulated Amortization (717) (650)
Net Carrying Amount $ 760 825
Service agreements    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 23 years  
Gross Carrying Amount $ 3,249 1,116
Accumulated Amortization (833) (728)
Net Carrying Amount $ 2,416 388
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 20 years  
Gross Carrying Amount $ 576 378
Accumulated Amortization (293) (278)
Net Carrying Amount $ 283 100
Provider networks    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 21 years  
Gross Carrying Amount $ 383 0
Accumulated Amortization (15) 0
Net Carrying Amount $ 368 0
Technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 9 years  
Gross Carrying Amount $ 317 288
Accumulated Amortization (160) (141)
Net Carrying Amount $ 157 147
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 22 years  
Gross Carrying Amount $ 127 31
Accumulated Amortization (32) (27)
Net Carrying Amount $ 95 $ 4