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Fair Value - Other Fair Value Disclosures (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net of current maturities $ 5,444   $ 8,672
Tangible asset impairment charges 0 $ 0  
Impairment of intangible assets 0 0  
Impairment of other intangible assets 0 $ 0  
Fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net of current maturities 5,500   8,200
Carrying value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net of current maturities $ 5,200   $ 8,400