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Segments of Business - Schedule of Segment Information (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2026
USD ($)
segment
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Segment revenues      
Revenues $ 403,430 $ 359,051 $ 308,951
Other segment expense, net      
Total other expense, net 396,051 353,631 304,059
Segment operating profit      
Subtotal 7,379 5,420 4,892
Interest expense (247) (265) (252)
Income before income taxes 6,201 4,359 3,789
Segment depreciation and amortization      
Total segment depreciation and amortization 729 636 635
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets $ 745 859 687
Number of reportable segments | segment 4    
Provision for bad debts $ (100) 130 (819)
Charge associated with last-in, first-out inventory method (210) 82 (157)
Restructuring, impairment, and related charges, net 245 344 115
Income (loss) from equity method investments (7) (9) (4)
Other, net 44 (38) 34
Net gains (losses) on investments in equity securities   101 (24)
Rx Savings Solutions, LLC      
Segment expenditures for long-lived assets      
Fair value adjustment gain     (78)
North American Pharmaceutical      
Segment expenditures for long-lived assets      
Provision for bad debts   206 (725)
North American Pharmaceutical | Held-for-sale | Canadian Retail Disposal Group      
Segment expenditures for long-lived assets      
Canadian businesses held for sale   605  
Operating Segments | Norway Disposal Group      
Segment expenditures for long-lived assets      
Other, net 503    
Operating Segments | North American Pharmaceutical      
Segment revenues      
Revenues 336,652 304,507 261,368
Other segment expense, net      
Total other expense, net 332,994 301,562 259,030
Segment operating profit      
Subtotal 3,658 2,945 2,338
Segment depreciation and amortization      
Total segment depreciation and amortization 134 155 197
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets $ 334 $ 243 $ 159
Revenue derived from services (less than) (as a percent) 1.00% 1.00% 1.00%
Provision for bad debts $ 210   $ 157
Charge associated with last-in, first-out inventory method   $ 82  
Net cash proceeds from settlements 23 444 244
Restructuring, impairment, and related charges, net 24 59 20
Income (loss) from equity method investments   43  
Operating Segments | North American Pharmaceutical | National Prescription Opiate Litigation      
Segment expenditures for long-lived assets      
Pre-tax charges related to estimated litigation liability   57 74
Operating Segments | Oncology & Multispecialty      
Segment revenues      
Revenues 48,423 36,862 30,490
Other segment expense, net      
Total other expense, net 47,274 36,095 29,783
Segment operating profit      
Subtotal 1,149 767 707
Segment depreciation and amortization      
Total segment depreciation and amortization 240 148 137
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets $ 78 $ 88 $ 96
Revenue derived from services (less than) (as a percent) 7.00% 7.00% 7.00%
Restructuring, impairment, and related charges, net $ 0 $ 1 $ 9
Gain from cost and equity method investments 51    
Operating Segments | Oncology & Multispecialty | PRISM Vision and Core Ventures      
Segment expenditures for long-lived assets      
Integration-related cost, expense 96    
Operating Segments | Prescription Technology Solutions      
Segment revenues      
Revenues 5,805 5,216 4,769
Other segment expense, net      
Total other expense, net 4,761 4,341 3,934
Segment operating profit      
Subtotal 1,044 875 835
Segment depreciation and amortization      
Total segment depreciation and amortization 82 86 84
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets $ 4 $ 11 $ 31
Revenue derived from services (less than) (as a percent) 43.00% 43.00% 43.00%
Restructuring, impairment, and related charges, net $ 20 $ 12 $ 11
Operating Segments | Medical-Surgical Solutions      
Segment revenues      
Revenues 11,507 11,380 11,309
Other segment expense, net      
Total other expense, net 10,569 10,601 10,354
Segment operating profit      
Subtotal 938 779 955
Segment depreciation and amortization      
Total segment depreciation and amortization 96 91 82
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets $ 94 $ 163 $ 159
Revenue derived from services (less than) (as a percent) 1.00% 1.00% 1.00%
Restructuring, impairment, and related charges, net $ 43 $ 204 $ 11
Separation costs 25    
Other      
Segment revenues      
Revenues 1,043 1,086 1,015
Other segment expense, net      
Total other expense, net 453 1,032 958
Segment operating profit      
Subtotal 590 54 57
Segment depreciation and amortization      
Total segment depreciation and amortization 4 18 14
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets 10 17 13
Corporate & Other      
Segment operating profit      
Corporate expenses, net (931) (796) (851)
Interest expense (247) (265) (252)
Segment depreciation and amortization      
Total segment depreciation and amortization 173 138 121
Segment expenditures for long-lived assets      
Total segment expenditures for long-lived assets 225 337 229
Restructuring, impairment, and related charges, net 158 68 64
Other, net   (87)  
Net gains (losses) on investments in equity securities   101 (24)
Corporate & Other | National Prescription Opiate Litigation      
Segment expenditures for long-lived assets      
Litigation settlement payments 11 14 35
Corporate & Other | National Prescription Opiate Litigation      
Segment expenditures for long-lived assets      
Pre-tax charges related to estimated litigation liability   51 $ 73
Corporate & Other | Canadian Retail Disposal Group      
Segment expenditures for long-lived assets      
Other comprehensive loss   $ 62  
Corporate & Other | Norway Disposal Group      
Segment expenditures for long-lived assets      
Other, net 23    
Corporate & Other | Medical-Surgical Solutions      
Segment expenditures for long-lived assets      
Separation costs $ 52