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Quarterly Financial Information (Unaudited)
 12 Months Ended
Mar. 31, 2021
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (Unaudited) Quarterly Financial Information (Unaudited)
The quarterly results of operations are not necessarily indicative of the results that may be expected for the entire year. Selected quarterly financial information for the last two years is as follows:
(In millions, except per share amounts)First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
Fiscal 2021
Revenues$55,679 $60,808 $62,599 $59,142 
Gross profit 2,700 3,000 3,151 3,297 
Income (loss) after income taxes:
Continuing operations
$495 $627 $(6,174)$713 
Discontinued operations
(1)— — — 
Net income (loss)$494 $627 $(6,174)$713 
Net income (loss) attributable to McKesson Corporation$444 $577 $(6,226)$666 
Earnings (loss) per common share attributable
to McKesson Corporation (1)
Diluted (2)
Continuing operations
$2.72 $3.54 $(39.03)$4.15 
Discontinued operations
— — — — 
Total$2.72 $3.54 $(39.03)$4.15 
Basic
Continuing operations$2.74 $3.56 $(39.03)$4.19 
Discontinued operations— — — — 
Total$2.74 $3.56 $(39.03)$4.19 
Fiscal 2020First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
Revenues$55,728 $57,616 $59,172 $58,535 
Gross profit2,787 2,867 3,033 3,336 
Income (loss) after income taxes:
Continuing operations$483 $(676)$247 $1,072 
Discontinued operations
(6)(1)(5)6 
Net income (loss)$477 $(677)$242 $1,078 
Net income (loss) attributable to McKesson Corporation$423 $(730)$186 $1,021 
Earnings (loss) per common share attributable
to McKesson Corporation (1)
Diluted (2)
Continuing operations
$2.27 $(3.99)$1.06 $5.82 
Discontinued operations
(0.03)— (0.03)0.03 
Total$2.24 $(3.99)$1.03 $5.85 
Basic
Continuing operations$2.28 $(3.99)$1.06 $5.86 
Discontinued operations(0.03)— (0.02)0.03 
Total$2.25 $(3.99)$1.04 $5.89 
(1)Certain computations may reflect rounding adjustments.
(2)As a result of the Company’s reported net loss for the third quarter of 2021 and the second quarter of 2020, potentially dilutive securities were excluded from the per share computations for those quarters due to their antidilutive effect.