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Pension Benefits - Narrative (Details) - Pension Plan - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic pension expense | $ 5 | $ 6 | $ 19 | $ 16 |
Cash contributions to the plans | $ 6 | $ 5 | $ 53 | $ 46 |
Percentage threshold of greater of projected benefit obligation or market value of assets (percent) | 10.00% |  | 10.00% |  |
United States |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated comprehensive loss | $ 115 |  | $ 115 |  | $ 120

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