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Debt (2018 Revolving Credit Facility - Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 26, 2018
USD ($)
Jun. 30, 2020
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]                
Repayments of long-term debt     $ 1,191,000,000 $ 287,000,000        
Long-term Debt [Member]                
Debt Instrument [Line Items]                
Debt instrument     3,602,000,000       $ 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]                
Debt Instrument [Line Items]                
Debt instrument     $ 360,000,000          
Amount outstanding 2,000,000,000              
Current borrowing capacity 3,200,000,000              
Maximum borrowing capacity $ 3,500,000,000              
Credit facility, maturity date Apr. 26, 2023   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]                
Debt Instrument [Line Items]                
Minimum interest coverage ratio 1.00              
Long-term Debt [Member] | 2018 Credit Facility [Member] | Maximum [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]                
Debt Instrument [Line Items]                
Basis points 1.50%              
Long-term Debt [Member] | 2018 Credit Facility [Member] | Eurodollar [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Basis points 2.50%              
Long-term Debt [Member] | 2018 Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Basis points 0.50%              
Long-term Debt [Member] | 2018 Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Basis points 1.50%              
Long-term Debt [Member] | Letter of Credit [Member]                
Debt Instrument [Line Items]                
Amount outstanding     $ 169,000,000       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
Repayments of long-term debt $ 1,191,000,000