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Segments of Business - Schedule of Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Segment revenues      
Revenues $ 263,966 $ 238,228 $ 231,051
Segment operating profit (loss)      
Operating income 3,370 3,828 2,366
Corporate expenses, net (1,073) (8,645) (973)
Loss on debt extinguishment (191) 0 0
Interest expense (178) (217) (249)
Income (loss) from continuing operations before income taxes 1,928 (5,034) 1,144
Segment depreciation and amortization      
Total depreciation and amortization 760 887 922
Segment expenditures for long-lived assets      
Total expenditures for long-lived assets 535 641 506
Corporate      
Segment operating profit (loss)      
Operating income 0 0 (1,113)
Segment depreciation and amortization      
Total depreciation and amortization 117 125 136
Segment expenditures for long-lived assets      
Total expenditures for long-lived assets 137 104 120
U.S. Pharmaceutical      
Segment revenues      
Revenues 212,149 189,274 181,700
U.S. Pharmaceutical | Operating Segments      
Segment operating profit (loss)      
Operating income 2,879 2,763 2,745
Segment depreciation and amortization      
Total depreciation and amortization 228 211 208
Segment expenditures for long-lived assets      
Total expenditures for long-lived assets 137 246 109
Prescription Technology Solutions      
Segment revenues      
Revenues 3,864 2,890 2,705
Prescription Technology Solutions | Operating Segments      
Segment operating profit (loss)      
Operating income 500 395 396
Segment depreciation and amortization      
Total depreciation and amortization 82 87 85
Segment expenditures for long-lived assets      
Total expenditures for long-lived assets 10 22 23
Medical-Surgical Solutions      
Segment revenues      
Revenues 11,608 10,099 8,305
Medical-Surgical Solutions | Operating Segments      
Segment operating profit (loss)      
Operating income 959 707 499
Segment depreciation and amortization      
Total depreciation and amortization 129 130 136
Segment expenditures for long-lived assets      
Total expenditures for long-lived assets 74 57 36
International      
Segment revenues      
Revenues 36,345 35,965 38,341
International | Operating Segments      
Segment operating profit (loss)      
Operating income (968) (37) (161)
Segment depreciation and amortization      
Total depreciation and amortization 204 334 357
Segment expenditures for long-lived assets      
Total expenditures for long-lived assets $ 177 $ 212 $ 218