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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 02, 2021 | Jan. 28, 2021 | Mar. 10, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 27, 2021 | Nov. 30, 2020 | Oct. 31, 2020 | Jan. 22, 2020 | Jan. 23, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 1,125,000,000 | 1,125,000,000 |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 456,700,000 | 453,600,000 |  |  |  |  |  |
Common stock, aggregate purchase price |  |  |  | $ 91,346,000 | $ 90,720,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.20 | $ 0.20 |  |  |  |  |  |
Common stock dividend per common share |  |  |  | $ 0.12 | $ 0.12 |  |  |  |  |  |
Common stock dividends |  |  |  |  |  | $ 0 |  |  |  |  |
Common stock repurchased (in shares) |  |  | 44,900,000 | 47,736,847 | 16,962,199 | 0 |  |  |  |  |
Repurchase amount (in dollars per share) |  |  |  | $ 75,000,000 |  |  |  |  |  |  |
2020 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price (not to exceed) |  |  |  |  |  |  |  |  |  | $ 600,000,000 |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares outstanding (in shares) |  |  |  | 2,500,000 | 4,000,000 |  |  |  |  |  |
Preferred stock liquidation preference (in dollars per share) |  |  |  | $ 100 |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  | 2,000,000 |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  | 1,489,304 |  |  |
Common stock, aggregate purchase price |  |  |  |  |  |  |  | $ 68,000,000 |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 45 |  |  |
Series B Preferred Stock | Three Month LIBOR |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate (as a percentage) |  |  |  | 170.00% |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 1,125,000,000 |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.20 |  |  |  |  |  |  |
Common stock shares outstanding (in shares) |  |  |  | 375,000,000 |  |  |  |  |  |  |
Common shares unissued but encumbered (in shares) |  |  |  | 35,000,000 |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  | $ 12.39 |  |  |  |  |  |  |
Common Stock | 2019 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price (not to exceed) |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Common stock repurchased (in shares) |  |  |  | 3,000,000 | 17,000,000 |  |  |  |  |  |
Repurchase amount (in dollars per share) |  |  |  | $ 33,000,000 | $ 167,000,000 |  |  |  |  |  |
Common Stock | 2020 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  |  | 44,900,000 |  |  |  |  |  |  |  |
Payment for delivery of common stock |  |  | $ 525,000,000 |  |  |  |  |  |  |  |
Common Stock | Subsequent Event | 2020 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | 58,000,000 |  |  |  |  |  |  |  |  |
Repurchase amount (in dollars per share) |  | $ 9.01 |  |  |  |  |  |  |  |  |
Additional shares repurchased |  | 13,000,000 |  |  |  |  |  |  |  |  |
Common Stock | Subsequent Event | 2021 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price (not to exceed) |  |  |  |  |  |  | $ 1,250,000,000 |  |  |  |
Common Stock | Subsequent Event | Tender Offer |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.20 |  |  |  |  |  |  |  |  |  |
Aggregate purchase price (not to exceed) | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Common Stock | Subsequent Event | Tender Offer | Maximum |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase amount (in dollars per share) | 15.00 |  |  |  |  |  |  |  |  |  |
Common Stock | Subsequent Event | Tender Offer | Minimum |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase amount (in dollars per share) | $ 13.10 |  |  |  |  |  |  |  |  |  |

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