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Long Term Debt - Consolidated Debt Obligations (Parenthetical) (Detail) (USD $)
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12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| OLLC $2.0 billion revolving credit facility [Member] | ||
| Debt Obligations [Abstract] | ||
| Senior Notes maturity date | March 2018 | |
| Revolving credit facility | $ 2,000,000,000 | |
| Senior Secured Notes [Member] | Notes Due 2021 [Member] | ||
| Debt Obligations [Abstract] | ||
| Senior Notes maturity date | May 2021 | |
| Estimated fair value of fixed rate debt | 563,500,000 | 721,000,000 |
| Senior Secured Notes [Member] | Notes Due 2022 [Member] | ||
| Debt Obligations [Abstract] | ||
| Senior Notes maturity date | August 2022 | |
| Estimated fair value of fixed rate debt | $ 380,000,000 |