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Debt - Holding Company Debt (Details) - Holding Company - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2021 | Jan. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | May 31, 2019 | Dec. 31, 2017 | Jan. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt | $ (4) | $ 2 |  |  |  |  |  |  |
6.000% senior unsecured notes due 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on debt instrument |  |  |  |  |  | 6.00% | 6.00% |  |
5.875% senior unsecured notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on debt instrument | 5.875% |  |  |  |  |  |  |  |
Repayment of senior notes | $ 1,350 |  |  |  |  |  |  |  |
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% | 6.25%
6.250% senior unsecured notes due 2022 | Subsequent event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 750 |  |  |  |  |  |
Interest rate on debt instrument |  |  | 6.25% |  |  |  |  |  |
6.750% senior unsecured notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  | $ 500
Interest rate on debt instrument | 6.75% |  |  |  |  |  |  |  | 6.75%
4.750% senior unsecured notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 600 | $ 500 |  |  |  |
Interest rate on debt instrument | 4.75% |  |  | 4.75% | 4.75% |  |  |  |
6.375% senior unsecured notes due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  | $ 750 |
Interest rate on debt instrument | 6.375% |  |  |  |  |  |  | 6.375% |
6.250% senior unsecured notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 1,250 | $ 1,250 |  |
Interest rate on debt instrument | 6.25% |  |  |  |  | 6.25% | 6.25% |  |
5.250% senior unsecured notes due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount | $ 250 | $ 750 |  |  |  |  |  |  |
Interest rate on debt instrument | 5.25% | 5.25% |  |  |  |  |  |  |
4.375% senior unsecured notes due 2029 | Subsequent event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 750 |  |  |  |  |  |
Interest rate on debt instrument |  |  | 4.375% |  |  |  |  |  |

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