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Long-term Debt (Details)
Jun. 30, 2019
USD ($)
Rate
Debt Instrument [Line Items]  
Aggregate loan commitments $ 1,500,000,000
Outstanding borrowing $ 0
7.50% Senior notes due 2020  
Debt Instrument [Line Items]  
Stated interest rate | Rate 7.50%
Principal balance $ 450,000,000