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Subsequent Events (Narrative) (Details)
3 Months Ended 12 Months Ended
Apr. 26, 2018
USD ($)
Jun. 30, 2020
Mar. 31, 2018
USD ($)
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
2018 Credit Facility [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Line of credit, amount borrowed $ 360,000,000            
Long-term Debt [Member]              
Debt Instrument [Line Items]              
Debt instrument     $ 4,433,000,000     $ 4,433,000,000  
Long-term Debt [Member] | 2016 Credit Facility [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity     743,000,000       $ 743,000,000
Line of credit, amount borrowed     0        
Long-term Debt [Member] | 2018 Credit Facility [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity 3,500,000,000            
Amount outstanding 2,000,000,000            
Current borrowing capacity $ 3,200,000,000            
Credit facility, maturity date Apr. 26, 2023            
Amount to be amended, redeemed or refinanced to avoid acceleration $ 700,000,000            
Accelerated maturity date if not amended, redeemed or refinanced Dec. 14, 2021            
Line of credit, amount borrowed $ 360,000,000            
Long-term Debt [Member] | 2018 Credit Facility [Member] | Minimum [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Minimum interest coverage ratio 1.00            
Long-term Debt [Member] | 2018 Credit Facility [Member] | Maximum [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Leverage ratio, percentage of credit limit 10.00%            
Leverage ratio, amount of credit limit $ 150,000,000            
Long-term Debt [Member] | 2018 Credit Facility [Member] | Maximum [Member] | Scenario, Forecast [Member]              
Debt Instrument [Line Items]              
Leverage ratio   4.00   4.25 4.50    
Long-term Debt [Member] | 2018 Credit Facility [Member] | Eurodollar [Member] | Minimum [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Basis points 1.50%            
Long-term Debt [Member] | 2018 Credit Facility [Member] | Eurodollar [Member] | Maximum [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Basis points 2.50%            
Long-term Debt [Member] | 2018 Credit Facility [Member] | Base Rate [Member] | Minimum [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Basis points 0.50%            
Long-term Debt [Member] | 2018 Credit Facility [Member] | Base Rate [Member] | Maximum [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Basis points 1.50%            
Long-term Debt [Member] | Letter of Credit [Member]              
Debt Instrument [Line Items]              
Amount outstanding $ 323,000,000   323,000,000        
2016 Term Loan due December 2020 [Member] | Long-term Debt [Member]              
Debt Instrument [Line Items]              
Debt instrument     $ 1,191,000,000     $ 1,191,000,000 $ 1,191,000,000
2016 Term Loan due December 2020 [Member] | Long-term Debt [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Repayments of long-term debt $ 1,191,000,000