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Redeemable Noncontrolling Interests and Noncontrolling Interests - Schedule of Changes in Noncontrolling Interests and Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Beginning balance $ 196    
Redeemable Noncontrolling Interest, Beginning balance 1,271    
Net income attributable to noncontrolling interests 173 $ 199 $ 220
Payments to noncontrolling interests (155) (177) (154)
Reclassification of McKesson Europe redeemable noncontrolling interests 287    
Ending balance 480 196  
Redeemable Noncontrolling Interest, Ending balance 0 1,271  
Noncontrolling Interests      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Beginning balance 196 217 193
Net income attributable to noncontrolling interests 165 156 178
Other comprehensive income (4) 0 0
Reclassification of recurring compensation to other accrued liabilities (7) 0 0
Payments to noncontrolling interests (155) (177) (154)
Exercises of Put Right 0 0  
Reclassification of McKesson Europe redeemable noncontrolling interests 287    
Other (2) 0 0
Ending balance 480 196 217
Redeemable Noncontrolling Interests      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Redeemable Noncontrolling Interest, Beginning balance 1,271 1,402 1,393
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest 8 43 42
Other comprehensive income 3 (79) 3
Reclassification of recurring compensation to other accrued liabilities (8) (43) (42)
Payments to noncontrolling interests 0 0 0
Exercises of Put Right (983) (49)  
Reclassification of McKesson Europe redeemable noncontrolling interests (287)    
Other (4) (3) 6
Redeemable Noncontrolling Interest, Ending balance $ 0 $ 1,271 $ 1,402