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Indebtedness - Summary of Unsecured Senior Notes (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Unsecured senior notes, net | $ 2,074,000,000 | $ 2,074,000,000
Unsecured Senior Notes |  |
Debt Instrument [Line Items] |  |
Unsecured senior notes principal amount | 2,100,000,000 | 2,100,000,000
Unamortized debt issuance costs | (26,000,000) | (26,000,000)
Unsecured senior notes, net | 2,074,000,000 | 2,074,000,000
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 | 850,000,000
Face value | $ 850,000,000 |
Interest Rate | 5.50% |
Unsecured Senior Notes | $650 face value, 5.125% interest rate payable semi-annually, due December 2030 |  |
Debt Instrument [Line Items] |  |
Unsecured senior notes principal amount | $ 650,000,000 | 650,000,000
Face value | $ 650,000,000 |
Interest Rate | 5.125% |
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 | $ 600,000,000
Face value | $ 600,000,000 |
Interest Rate | 6.00% |

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