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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Segment revenues        
Total revenues   $ 276,711 $ 263,966 $ 238,228
Segment operating profit (loss)        
Total operating profit (loss)   5,025 3,370 3,828
Corporate expenses, net   (147) (1,073) (8,645)
Loss on debt extinguishment   0 (191) 0
Interest expense   (248) (178) (217)
Income (loss) from continuing operations before income taxes   4,630 1,928 (5,034)
Segment depreciation and amortization        
Total depreciation and amortization   608 760 887
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   558 535 641
Charges (credits) associated with last-in, first-out inventory method   1 (23) (38)
Charge for remeasurement to fair value   0 1,509 0
Goodwill impairment charge   0 0 69
Long-lived asset impairment charges, before tax   0    
Gain on derivative termination   (97)    
Restructuring charges   209 245 219
Net gains (losses) on investments in equity securities   (36) 98 133
Shareholder Derivative Action        
Segment operating profit (loss)        
Corporate expenses, net       (131)
Tax Receivable Agreement (“TRA”)        
Segment expenditures for long-lived assets        
Gain for early termination of tax receivable agreement   126    
German Wholesale Business        
Segment expenditures for long-lived assets        
Gain from sale of equity method investment     42  
Held-for-sale | E.U. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value     438  
Held-for-sale | U.K. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value     1,200  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | E.U. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value   (66)    
National Prescription Opiate Litigation        
Segment expenditures for long-lived assets        
Loss contingency accrual, period increase (decrease)   (8) $ 274 8,100
Operating Segments | German Wholesale Business        
Segment expenditures for long-lived assets        
Noncontrolling interest (percent)     30.00%  
Corporate        
Segment depreciation and amortization        
Total depreciation and amortization   124 $ 117 125
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   173 137 104
Restructuring charges   83 100 105
Corporate | National Prescription Opiate Litigation        
Segment expenditures for long-lived assets        
Litigation settlement payments   36 130 153
Corporate | Held-for-sale | E.U. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value   (306) 55  
Corporate | Held-for-sale | U.K. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value     42  
U.S. Pharmaceutical        
Segment revenues        
Total revenues   240,616 212,149 189,274
U.S. Pharmaceutical | New York Opioid Tax Surcharge        
Segment expenditures for long-lived assets        
Charge recorded related to Company's share of the litigation settlement   18   50
U.S. Pharmaceutical | Operating Segments        
Segment operating profit (loss)        
Total operating profit (loss)   3,206 2,879 2,763
Segment depreciation and amortization        
Total depreciation and amortization   212 228 211
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 154 $ 137 $ 246
Revenue derived from services, percentage (less than)   1.00% 1.00% 1.00%
Net cash proceeds from settlements   $ 129 $ 46 $ 181
Charges (credits) associated with last-in, first-out inventory method   (1) 23 38
Gain from sale of equity method investment   142    
Proceeds from sale of equity method investment $ 179      
Restructuring charges   38 35 21
U.S. Pharmaceutical | Operating Segments | New York Opioid Tax Surcharge        
Segment expenditures for long-lived assets        
Charge recorded related to Company's share of the litigation settlement   18   50
Prescription Technology Solutions        
Segment revenues        
Total revenues   4,387 3,864 2,890
Prescription Technology Solutions | Operating Segments        
Segment operating profit (loss)        
Total operating profit (loss)   566 500 395
Segment depreciation and amortization        
Total depreciation and amortization   77 82 87
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 35 $ 10 $ 22
Revenue derived from services, percentage (less than)   40.00% 40.00% 40.00%
Restructuring charges   $ 43 $ 25 $ 4
Medical-Surgical Solutions        
Segment revenues        
Total revenues   11,110 11,608 10,099
Segment expenditures for long-lived assets        
Inventory write-down charges     164 136
Medical-Surgical Solutions | Operating Segments        
Segment operating profit (loss)        
Total operating profit (loss)   1,117 959 707
Segment depreciation and amortization        
Total depreciation and amortization   80 129 130
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 117 $ 74 $ 57
Revenue derived from services, percentage (less than)   2.00% 2.00% 2.00%
Restructuring charges   $ 10 $ 9 $ 4
International        
Segment revenues        
Total revenues   20,598 36,345 35,965
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value       58
Long-lived asset impairment charges, before tax     36  
International | Operating Segments        
Segment operating profit (loss)        
Total operating profit (loss)   136 (968) (37)
Segment depreciation and amortization        
Total depreciation and amortization   115 204 334
Segment expenditures for long-lived assets        
Total expenditures for long-lived assets   $ 79 $ 177 $ 212
Revenue derived from services, percentage (less than)   8.00% 8.00% 8.00%
Goodwill impairment charge       $ 69
Long-lived asset impairment charges, before tax       115
Restructuring charges   $ 35 $ 76 $ 85
International | Operating Segments | Held-for-sale | E.U. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value   $ 240 383  
International | Operating Segments | Held-for-sale | U.K. Businesses (Disposal Group)        
Segment expenditures for long-lived assets        
Charge for remeasurement to fair value     1,100  
International | Operating Segments | Held-for-sale | German Wholesale Business | Walgreens Boots Alliance Joint Venture        
Segment expenditures for long-lived assets        
Gain from sale of equity method investment     42  
International | Operating Segments | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Canadian Health Benefit Claims Management and Plan Administrative Services Business        
Segment expenditures for long-lived assets        
Pre-tax gain on sale of business     $ 59