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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 8,068 $ 9,647 $ 8,287 $ 10,057
Other comprehensive income (loss) before reclassifications (23) 29 41 (93)
Amounts reclassified to earnings 79 3 92 4
Other Comprehensive Income (Loss), Net of Tax 56 32 133 (89)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (18) (7) (12) (44)
Other comprehensive income (loss) attributable to McKesson 74 39 145 (45)
Ending balance 6,692 9,534 6,692 9,534
Foreign Currency Translation Adjustments, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,564) (1,492) (1,628) (1,258)
Other comprehensive income (loss) before reclassifications (114) 5 (44) (268)
Amounts reclassified to earnings 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax (114) 5 (44) (268)
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests (19) (7) (13) (46)
Other comprehensive income (loss) attributable to McKesson (95) 12 (31) (222)
Ending balance (1,659) (1,480) (1,659) (1,480)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 27 (44) 53 (188)
Other comprehensive income (loss) before reclassifications 82 21 56 165
Amounts reclassified to earnings 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax 82 21 56 165
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0 0 0 0
Other comprehensive income (loss) attributable to McKesson 82 21 56 165
Ending balance 109 (23) 109 (23)
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (25) (61) (37) (61)
Other comprehensive income (loss) before reclassifications 13 2 25 2
Amounts reclassified to earnings 0 0 0 0
Other Comprehensive Income (Loss), Net of Tax 13 2 25 2
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 0 0 0 0
Other comprehensive income (loss) attributable to McKesson 13 2 25 2
Ending balance (12) (59) (12) (59)
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (216) (204) (237) (210)
Other comprehensive income (loss) before reclassifications (4) 1 4 8
Amounts reclassified to earnings 79 3 92 4
Other Comprehensive Income (Loss), Net of Tax 75 4 96 12
Less: amounts attributable to noncontrolling and redeemable noncontrolling interests 1 0 1 2
Other comprehensive income (loss) attributable to McKesson 74 4 95 10
Ending balance (142) (200) (142) (200)
Total Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,778) (1,801) (1,849) (1,717)
Other comprehensive income (loss) attributable to McKesson 74 39 145 (45)
Ending balance $ (1,704) $ (1,762) $ (1,704) $ (1,762)