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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 44.20% | 29.10% | 54.50% | (11.50%)
Foreign earnings not indefinitely reinvested | $ 547 |  | $ 547 |
Potential federal and state tax cost | 410 |  | 410 |
Decrease in liability for uncertain tax positions | 13 |  |  |
Reasonably possible reduction in liability for uncertain tax positions | 37 |  | 37 |
HPES |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax indemnification payable, net | 3 |  | 3 |
Tax indemnification receivable, uncertain tax positions | 48 |  | 48 |
Tax indemnification receivable, tax indemnification payable | 79 |  | 79 |
Tax indemnification payable | 130 |  | 130 |
Perspecta |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax indemnification payable | 44 |  | 44 |
Tax indemnification receivable | $ 81 |  | $ 81 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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