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Indebtedness - Summary of Unsecured Senior Notes (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 13, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unsecured senior notes, net | $ 2,462,000,000 | $ 2,459,000,000 |
$950 face value, 8.125% interest rate payable semi-annually, due July 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued |  |  | $ 950,000,000
Interest Rate |  |  | 8.125%
$750 face value, 9.125% interest rate payable semi-annually, due July 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt issued |  |  | $ 750,000,000
Interest Rate |  |  | 9.125%
Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | 2,498,000,000 | 2,498,000,000 |
Unamortized debt issuance costs | (36,000,000) | (39,000,000) |
Unsecured senior notes, net | 2,462,000,000 | 2,459,000,000 |
Debt issued | 2,498,000,000 |  |
Unsecured Senior Notes | $950 face value, 8.125% interest rate payable semi-annually, due July 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | 950,000,000 | 950,000,000 |
Debt issued | $ 950,000,000 |  |
Interest Rate | 8.125% |  |
Unsecured Senior Notes | $750 face value, 9.125% interest rate payable semi-annually, due July 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 750,000,000 | 750,000,000 |
Debt issued | $ 750,000,000 |  |
Interest Rate | 9.125% |  |
Unsecured Senior Notes | $600 face value, 6.500% interest rate payable semi-annually, due July 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 592,000,000 | 592,000,000 |
Debt issued | $ 600,000,000 |  |
Interest Rate | 6.50% |  |
Unsecured Senior Notes | $300 face value, 6.500% interest rate payable semi-annually, due June 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured senior notes principal amount | $ 206,000,000 | $ 206,000,000 |
Debt issued | $ 300,000,000 |  |
Interest Rate | 6.50% |  |

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