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Goodwill and Intangible Assets, Net (Tables)
 6 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in the Carrying Amount of Goodwill
Changes in the carrying amount of goodwill were as follows:
(In millions)North American PharmaceuticalOncology & MultispecialtyPrescription Technology SolutionsMedical-Surgical Solutions
Other (2)
Total
Balance, March 31, 2025$2,737 $2,724 $2,027 $2,507 $27 $10,022 
Goodwill acquired— 1,238 39 — — 1,277 
Disposals — (9)— — (28)(37)
Foreign currency translation adjustments, net44 — — — 1 45 
Other adjustments (1)
— (24)— — — (24)
Balance, September 30, 2025$2,781 $3,929 $2,066 $2,507 $— $11,283 
(1)Reflects acquisition-related adjustments of $21 million for Core Ventures and $3 million for PRISM Vision.
(2)Primarily includes transfer of goodwill of $28 million to held-for-sale for the Norway disposal group.
Schedule of Information Regarding Intangible Assets
Information regarding intangible assets was as follows:
 September 30, 2025March 31, 2025
(Dollars in millions)Weighted-
Average
Remaining
Amortization
Period
(Years)		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Customer relationships10$1,510 $(690)$820 $1,475 $(650)$825 
Service agreements233,262 (759)2,503 1,116 (728)388 
Trademarks and trade names20570 (284)286 378 (278)100 
Provider Networks22360 (8)352 — — — 
Technology9311 (150)161 288 (141)147 
Other22127 (29)98 31 (27)4 
Total  $6,140 $(1,920)$4,220 $3,288 $(1,824)$1,464 
Schedule of Estimated Amortization Expense
(In millions)Estimated Amortization Expense
Fiscal 2026 (from October 1, 2025 to March 31, 2026)$144 
Fiscal 2027287 
Fiscal 2028283 
Fiscal 2029279 
Fiscal 2030276 
Thereafter2,951