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Debt Narrative - Holding Company Debt (Details) - Holding Company - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 06, 2017 | Jan. 18, 2017
Debt Instrument [Line Items] |  |  |  |
(Gain) loss on extinguishment of debt |  | $ 12 |  |
Additional borrowing availability | $ 2,000 |  |  |
6.750% senior unsecured notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt face amount |  |  |  | $ 500
Interest rate on debt instrument |  |  |  | 6.75%
6.250% senior unsecured notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt face amount |  |  | $ 510 | $ 695
Interest rate on debt instrument |  |  | 6.25% | 6.25%
6.375% senior unsecured notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt face amount |  |  | $ 750 |
Interest rate on debt instrument |  |  | 6.375% |

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