Debt - Schedule of Long-term Debt Instruments (Parenthetical) (Details) - USD ($) |
1 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||||
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Dec. 31, 2012 |
Jun. 30, 2015 |
Dec. 31, 2014 |
Mar. 31, 2015 |
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Senior Secured Revolving Credit Facility [Member] | ||||||||||||||
Debt Instrument [Line Items] | ||||||||||||||
Debt instrument, term | 5 years | |||||||||||||
Credit facility, maximum borrowing capacity | $ 1,250,000,000 | $ 1,750,000,000 | [1] | |||||||||||
Debt Instrument, Maturity Date | [1] | Jun. 16, 2020 | ||||||||||||
Credit facility, unused capacity, commitment fee percentage | 0.30% | |||||||||||||
Credit facility, remaining borrowing capacity | $ 1,750,000,000 | |||||||||||||
Senior Notes [Member] | 5.375% Senior Notes Due 2025 [Member] | ||||||||||||||
Debt Instrument [Line Items] | ||||||||||||||
Principal Amount | $ 1,000,000,000 | [2],[3] | $ 1,000,000,000 | |||||||||||
Interest rate on instrument | 5.375% | [2],[3] | 5.375% | |||||||||||
Unamortized discount | $ 11,250,000 | |||||||||||||
Debt Instrument, Maturity Date | [2],[3] | Apr. 15, 2025 | ||||||||||||
Senior Secured Notes [Member] | 5.25% Senior Notes Due 2022 [Member] | ||||||||||||||
Debt Instrument [Line Items] | ||||||||||||||
Principal Amount | [3],[4] | $ 400,000,000 | $ 400,000,000 | |||||||||||
Interest rate on instrument | [3],[4] | 5.25% | 5.25% | |||||||||||
Debt Instrument, Maturity Date | [3],[4] | Aug. 15, 2022 | Aug. 15, 2022 | |||||||||||
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