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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2020
Income tax expense | $ 20 | $ 48 |
Effective income tax rate | 17.00% | 31.00% |
Release of valuation allowance | $ 22 |  |
Other adjustments, state law changes | $ 6 |  |
Effective income tax rate, excluding effects of special items | 31.00% |  |
US federal statutory income tax rate | 21.00% |  |
Maximum [Member] | Scenario, Forecast [Member] |  |  |
Possible release of valuation allowance |  |  | $ 86

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