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Earnings (Loss) per Share - Schedule of Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |
Net income (loss) attributable to DXC common shareholders: | $ 1,098 | $ 82 | $ 649 | $ (1,874)
Common share information: |  |  |  |
Weighted average common shares outstanding for basic and diluted net (loss) EPS (in shares) | 254,320 | 255,090 | 254,030 | 260,240
Dilutive effect of stock options and equity awards (in shares) | 1,430 | 960 | 1,170 | 0
Weighted Average Number of Shares Outstanding, Diluted | 255,750 | 256,050 | 255,200 | 260,240
Earnings (loss) per share: |  |  |  |
Basic (in dollars per share) | $ 4.32 | $ 0.32 | $ 2.55 | $ (7.20)
Diluted (in dollars per share) | $ 4.29 | $ 0.32 | $ 2.54 | $ (7.20)

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