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Fair Value - Other Fair Value Disclosures (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, net of current maturities $ 7,698,000,000   $ 7,698,000,000   $ 5,470,000,000
Goodwill impairment 2,887,000,000 $ 0 2,887,000,000 $ 0  
Tangible asset impairment charges 0 0 0 0  
Impairment of intangible assets 0 0 0 0  
Impairment of other intangible assets 0 $ 0 0 $ 0  
Fair value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, net of current maturities 7,400,000,000   7,400,000,000   5,600,000,000
Carrying value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, net of current maturities $ 7,300,000,000   $ 7,300,000,000   $ 5,600,000,000