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Segments of Business - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2022
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Segment revenues        
Total revenues   $ 359,051 $ 308,951 $ 276,711
Other segment expense (income)   353,603 304,059 271,686
Segment operating profit (loss)        
Total operating profit (loss)   5,437 4,892 5,025
Interest expense   (265) (252) (248)
Income from continuing operations before income taxes   4,359 3,789 4,630
Segment depreciation and amortization        
Total depreciation and amortization   636 635 608
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   859 687 558
Provision for bad debts   (130) 819 45
Charges (credits) associated with last-in, first-out inventory method   82 (157) 1
Restructuring charges   344 115 209
Income (loss) from equity method investments   9 4 5
Other income (expense)   (38) 34 279
Net gains (losses) on investments in equity securities   101 (24) (36)
Gain on derivative termination       97
Rx Savings Solutions, LLC        
Segment expenditures for long-lived assets        
Fair value adjustment gain     (78)  
Tax Receivable Agreement (“TRA”)        
Segment expenditures for long-lived assets        
Gain for early termination of tax receivable agreement       126
Corporate        
Segment revenues        
Total revenues   11 0 0
Segment operating profit (loss)        
Corporate expenses, net   (813) (851) (147)
Interest expense   (265) (252) (248)
Segment depreciation and amortization        
Total depreciation and amortization   140 121 124
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   337 229 173
Restructuring charges   68 55 83
Other income (expense)   (87)    
Net gains (losses) on investments in equity securities   101 (24) (36)
Corporate | National Prescription Opiate Litigation        
Segment expenditures for long-lived assets        
Litigation settlement payments   14 35 36
Corporate | Canadian Retail Disposal Group        
Segment expenditures for long-lived assets        
Other comprehensive income (loss)   (62)    
Corporate | Held-for-sale | E.U. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value       (306)
Corporate | National Prescription Opiate Litigation        
Segment expenditures for long-lived assets        
Loss contingency accrual, period increase (decrease)   51 73 (8)
U.S. Pharmaceutical        
Segment expenditures for long-lived assets        
Provision for bad debts   (206) 725  
U.S. Pharmaceutical | Operating Segments        
Segment revenues        
Total revenues   327,717 278,739 240,616
Other segment expense (income)   323,715 275,953 237,410
Segment operating profit (loss)        
Total operating profit (loss)   4,002 2,786 3,206
Segment depreciation and amortization        
Total depreciation and amortization   231 229 212
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 241 $ 193 $ 154
Revenue derived from services, percentage (less than)   1.00% 1.00% 1.00%
Net cash proceeds from settlements   $ 444 $ 244 $ 129
Charges (credits) associated with last-in, first-out inventory method   82 (157) 1
Restructuring charges   59 17 38
Income (loss) from equity method investments   (43)    
Gain from sale of equity method investment       142
Proceeds from sale of equity method investment $ 179      
U.S. Pharmaceutical | Operating Segments | National Prescription Opiate Litigation        
Segment expenditures for long-lived assets        
Loss contingency accrual, period increase (decrease)   57 74  
Prescription Technology Solutions | Operating Segments        
Segment revenues        
Total revenues   5,216 4,769 4,387
Other segment expense (income)   4,341 3,934 3,821
Segment operating profit (loss)        
Total operating profit (loss)   875 835 566
Segment depreciation and amortization        
Total depreciation and amortization   86 84 77
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 11 $ 31 $ 35
Revenue derived from services, percentage (less than)   39.00% 39.00% 39.00%
Restructuring charges   $ 12 $ 11 $ 43
Medical-Surgical Solutions | Operating Segments        
Segment revenues        
Total revenues   11,386 11,313 11,110
Other segment expense (income)   10,613 10,361 9,993
Segment operating profit (loss)        
Total operating profit (loss)   773 952 1,117
Segment depreciation and amortization        
Total depreciation and amortization   93 84 80
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 163 $ 159 $ 117
Revenue derived from services, percentage (less than)   1.00% 1.00% 1.00%
Restructuring charges   $ 204 $ 11 $ 10
International | Held-for-sale | Canadian Retail Disposal Group        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value   605    
International | Operating Segments        
Segment revenues        
Total revenues   14,721 14,130 20,598
Other segment expense (income)   14,934 13,811 20,462
Segment operating profit (loss)        
Total operating profit (loss)   (213) 319 136
Segment depreciation and amortization        
Total depreciation and amortization   86 117 115
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 107 $ 75 $ 79
Revenue derived from services, percentage (less than)   1.00% 1.00% 1.00%
Restructuring charges   $ 1 $ 21 $ 35
International | Operating Segments | Held-for-sale | E.U. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value       $ 240