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Subsequent Event (Details) - USD ($) | Oct. 06, 2014 | Sep. 30, 2014
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The 2024 Notes |  |
Subsequent event |  |
Principal amount |  | $ 800,000,000
Interest rate (as a percent) |  | 5.875%
Subsequent Event [Member] | Notes |  |
Subsequent event |  |
Maximum duration within which the registration statement relating to the registered exchange offer is required to be declared effective | 390 days |
Minimum period that the exchange offer is required to be kept open after the date notice of the exchange offer is mailed to the holders of the Notes | 30 days |
Maximum duration within which the shelf registration statement relating to the resale of the Notes is required to be declared effective | 60 days |
Percentage of increase in annual interest rate when the debt is in default | 0.25% |
Additional percentage of increase in annual interest rate for each subsequent 90-day period during which the default continues | 0.25% |
Period during which additional percentage of increase in annual interest rate continues when the debt is in default | 90 days |
Maximum additional interest rate per year when the debt is in default | 1.00% |
Subsequent Event [Member] | The 2022 Notes |  |
Subsequent event |  |
Principal amount | $ 800,000,000 |
Interest rate (as a percent) | 5.75% |
Subsequent Event [Member] | The 2022 Notes | Redemption period one |  |
Subsequent event |  |
Redemption period, end date | Oct. 15, 2017 |
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed | 100.00% |
Percentage price of original principal amount of note at which note can be redeemed | 105.75% |
Subsequent Event [Member] | The 2022 Notes | Redemption period one | Maximum |  |
Subsequent event |  |
Percentage of principal amount that can be redeemed | 35.00% |
Subsequent Event [Member] | The 2024 Notes |  |
Subsequent event |  |
Principal amount | $ 800,000,000 |
Interest rate (as a percent) | 5.875% |
Subsequent Event [Member] | The 2024 Notes | Redemption period two |  |
Subsequent event |  |
Redemption period, end date | Jul. 15, 2024 |
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed | 100.00% |
Subsequent Event [Member] | The 2024 Notes | Redemption period three |  |
Subsequent event |  |
Redemption period, start date | Jul. 15, 2024 |
Percentage price of original principal amount of note at which note can be redeemed | 100.00% |

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