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Debt - Public Debt (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 21, 2020 | Apr. 06, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 24, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Payment for early redemption of debt |  |  |  | $ 59,000,000 | $ 0 |
Early termination premium |  |  | $ 35,000,000 |  |  |
Interest expense |  |  | $ 17,000,000 |  |  |
6.150% Notes, due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early redemption of debt |  | $ 1,000,000,000 |  |  |  |
Long-term debt, interest rate (percentage) |  | 6.15% | 6.15% | 6.15% |  |
Payment for early redemption of debt |  | $ 1,020,000,000 |  |  |  |
5.400% Notes due 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early redemption of debt | $ 589,000,000 | $ 300,000,000 |  |  |  |
Long-term debt, interest rate (percentage) | 5.40% | 5.40% | 5.40% | 5.40% |  |
Payment for early redemption of debt |  | $ 315,000,000 |  |  |  |
Interest expense |  |  | $ 24,000,000 |  |  |
6.875% Notes, due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, interest rate (percentage) |  |  | 6.875% | 6.875% |  | 6.875%
Aggregate principal amount |  |  |  |  |  | $ 1,200,000,000
Deferred financing costs |  |  | $ 14,000,000 | $ 14,000,000 |  |
5.870% Notes, due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early redemption of debt | $ 151,000,000 |  |  |  |  |
Long-term debt, interest rate (percentage) | 5.87% |  | 5.87% | 5.87% |  |
Interest expense |  |  | $ 4,000,000 |  |  |

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