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Debt (2018 Revolving Credit Facility - Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 26, 2018
USD ($)
Jun. 30, 2020
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Oct. 31, 2018
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]                    
Subsidiary ownership     100.00%              
Repayments of long-term debt     $ 1,191,000,000 $ 1,139,000,000            
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] | Subsequent Event [Member]                    
Debt Instrument [Line Items]                    
Current borrowing capacity                 $ 3,100,000,000  
Long-term Debt [Member] | 2018 Credit Facility [Member] | Scenario, Forecast [Member]                    
Debt Instrument [Line Items]                    
Current borrowing capacity               $ 2,100,000,000    
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                  
2016 Term Loan due December 2020 [Member] | Long-term Debt [Member] | 2016 Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Credit facility, maturity date             Dec. 01, 2020