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Debt Narrative - Holding Company Debt (Details) - Holding Company - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2017 | Jan. 23, 2020 | Dec. 12, 2019 | Sep. 06, 2019 | Jun. 27, 2019 | Dec. 06, 2017 | Jan. 18, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt | $ (2) | $ 12 |  |  |  |  |  |
Additional borrowing availability | $ 469 |  |  |  |  |  |  |
6.250% senior unsecured notes due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 1,250 |  |
Interest rate on debt instrument |  |  |  |  |  | 6.25% |  |
4.750% senior unsecured notes due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 500 |  |  |
Interest rate on debt instrument |  |  |  |  | 4.75% |  |  |
4.750% senior unsecured notes due 2024 | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 600 |  |  |  |  |
Interest rate on debt instrument |  |  | 4.75% |  |  |  |  |
5.250% senior unsecured notes due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 750 |  |  |  |
Interest rate on debt instrument |  |  |  | 5.25% |  |  |  |
5.250% senior unsecured notes due 2027 | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 250 |  |  |  |  |
Interest rate on debt instrument |  |  | 5.25% |  |  |  |  |
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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