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Indebtedness - Summary of Unsecured Senior Notes (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Unsecured senior notes, net | $ 2,167,000,000 | $ 2,366,000,000
Unsecured senior notes |  |
Debt Instrument [Line Items] |  |
Unsecured senior notes principal amount | 2,200,000,000 | 2,398,000,000
Unamortized debt issuance costs, premium and discount | (33,000,000) | (32,000,000)
Unsecured senior notes, net | 2,167,000,000 | 2,366,000,000
Unsecured senior notes | $850 Face Value, 5.500% interest payable semi-annually, due August 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured senior notes principal amount | 850,000,000 | 0
Face value | $ 850,000,000 |
Interest Rate | 5.50% |
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
Face value | $ 750,000,000 |
Interest Rate | 9.125% |
Unsecured senior notes | $600 face value, 6.000% interest rate payable semi-annually, due January 2027 |  |
Debt Instrument [Line Items] |  |
Unsecured senior notes principal amount | $ 600,000,000 | 0
Face value | $ 600,000,000 |
Interest Rate | 6.00% |
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 | $ 0 | 492,000,000
Face value | $ 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 | $ 0 | 206,000,000
Face value | $ 300,000,000 |
Interest Rate | 6.50% |
Unsecured senior notes | $950 face value, 8.125% interest rate payable semi-annually, due July 2023(4) |  |
Debt Instrument [Line Items] |  |
Unsecured senior notes principal amount | $ 0 | $ 950,000,000
Face value | $ 950,000,000 |
Interest Rate | 8.125% |

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