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Debt - Senior Notes (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 06, 2017
Debt Instrument [Line Items] |  |  |  |  |
Increase (Decrease) of Restricted Investments | $ 157,000,000 | $ (12,000,000) | $ 4,000,000 | $ (6,000,000) |
Available-for-sale securities | 2,693,000,000 | 2,693,000,000 | $ 1,758,000,000 |  |
Net carrying amount of debt | $ 2,041,000,000 | $ 2,041,000,000 |  |  |
4.875% Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of contractual interest rate | 4.875% | 4.875% |  |  |
5.375% Senior Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of contractual interest rate | 5.375% | 5.375% |  |  |
Subtotal - current restricted investments |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available-for-sale securities | $ 169,000,000 | $ 169,000,000 |  |  |
Senior Notes | 4.875% Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  |  |  | $ 330,000,000
Net carrying amount of debt | $ 330,000,000 | $ 330,000,000 |  |  |
Percentage of contractual interest rate | 4.875% | 4.875% |  |  | 4.875%
Senior Notes | 5.375% Senior Notes due 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount of debt | $ 700,000,000 | $ 700,000,000 |  |  |
Percentage of contractual interest rate | 5.375% | 5.375% |  |  |

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