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Fair Value - Financial Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net of current maturities $ 4,345 $ 8,672
Impairment of tangible assets 0 0
Impairment of intangible assets 0 0
Impairment of long-lived assets 0 0
Fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net of current maturities 4,700 8,200
Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, net of current maturities $ 4,400 $ 8,400