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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2019 | Apr. 01, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective income tax rate | 24.60% |  | 19.60% | 46.00% | 16.20% |  |
Foreign earnings not indefinitely reinvested | $ 518 |  |  | $ 518 |  |  |
Potential federal and state cost from tax examinations |  |  |  | 438 |  |  |
Increase in liability for uncertain tax positions |  | $ 29 |  |  |  |  |
Reasonably possible reduction in liability for uncertain tax positions | $ 43 |  |  | $ 43 |  |  |
HPES |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax indemnification receivable, uncertain tax positions |  |  |  |  |  |  | $ 34
Tax indemnification receivable, tax indemnification payable |  |  |  |  |  |  | 68
Tax indemnification payable |  |  |  |  |  |  | $ 120
Perspecta |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax indemnification payable |  |  |  |  |  | $ 29 |
Tax indemnification receivable |  |  |  |  |  | $ 73 |

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