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Fair Value - Other Fair Value Disclosures (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net of current maturities | $ 4,363 | $ 4,345
Goodwill impairment | 0 |
Tangible asset impairment charges | 0 |
Impairment of intangible assets | 0 |
Impairment of other intangible assets | 0 |
Fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net of current maturities | 4,200 | 4,700
Carrying value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net of current maturities | $ 4,100 | $ 4,400

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