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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]      
Revenues $ 403,430 $ 359,051 $ 308,951
Cost of sales (388,880) (345,728) (296,123)
Gross profit 14,550 13,323 12,828
Selling, distribution, general, and administrative expenses (8,096) (8,507) (8,657)
Claims and litigation charges, net 3 (108) (147)
Restructuring, impairment, and related charges, net (245) (286) (115)
Total operating expenses (8,338) (8,901) (8,919)
Operating income 6,212 4,422 3,909
Other income, net 236 202 132
Interest expense (247) (265) (252)
Income before income taxes 6,201 4,359 3,789
Income tax expense (1,102) (878) (629)
Net income 5,099 3,481 3,160
Net income attributable to noncontrolling interests (337) (186) (158)
Net income attributable to McKesson Corporation $ 4,762 $ 3,295 $ 3,002
Earnings (loss) per common share attributable to McKesson Corporation      
Diluted (in dollars per share) $ 38.38 $ 25.72 $ 22.39
Basic (in dollars per share) $ 38.55 $ 25.86 $ 22.54
Weighted-average common shares outstanding      
Diluted (in shares) 124.1 128.1 134.1
Basic (in shares) 123.6 127.4 133.2