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Debt and Capital Leases - Senior Notes Repurchased (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 02, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Loss on debt extinguishment, net |  | $ 1 | $ 0 | $ 3 | $ 2
Senior Notes |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Loss on debt extinguishment, net |  |  |  | 1 |
Write-off of deferred financing costs |  |  |  | 1 |
Recourse Debt | Senior Notes |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Principal amount repurchased |  | 43 |  | 43 |
Repurchase amount |  | 45 |  | 45 |
Accrued interest |  | $ 1 |  | $ 1 |
Recourse Debt | 5.750% senior notes due 2028 |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 5.75% |  | 5.75% |
Principal amount repurchased |  | $ 29 |  | $ 29 |
Repurchase amount |  | $ 30 |  | $ 30 |
Average Early Redemption Percentage |  |  |  | 99.24% |
Recourse Debt | 6.250% senior notes due 2022 |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 6.25% |  | 6.25% |
Principal amount repurchased |  | $ 14 |  | $ 14 |
Repurchase amount |  | $ 15 |  | $ 15 |
Average Early Redemption Percentage |  |  |  | 103.25% |
Recourse Debt | 6.625% senior notes due 2027 |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Interest rate, stated percentage |  | 6.625% |  | 6.625% |
Subsequent Event |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Principal amount repurchased | $ 89 |  |  |  |
Repurchase amount | $ 93 |  |  |  |
Subsequent Event | Recourse Debt | 5.750% senior notes due 2028 |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Interest rate, stated percentage | 5.75% |  |  |  |
Principal amount repurchased | $ 20 |  |  |  |
Repurchase amount | $ 21 |  |  |  |
Average Early Redemption Percentage | 99.13% |  |  |  |
Subsequent Event | Recourse Debt | 6.250% senior notes due 2022 |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Interest rate, stated percentage | 6.25% |  |  |  |
Principal amount repurchased | $ 6 |  |  |  |
Repurchase amount | $ 6 |  |  |  |
Average Early Redemption Percentage | 103.25% |  |  |  |
Subsequent Event | Recourse Debt | 6.625% senior notes due 2027 |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Interest rate, stated percentage | 6.25% |  |  |  |
Principal amount repurchased | $ 20 |  |  |  |
Repurchase amount | $ 21 |  |  |  |
Average Early Redemption Percentage | 103.06% |  |  |  |
Transformation Plan |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Additional amount committed to reduce debt balance to achieve target debt to EBITDA credit ratio |  |  |  | $ 640 |
Target net debt to EBITDA credit ratio |  |  |  | 3.0 |

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