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Common Stockholders' Equity and Preferred Securities (Details) - USD ($) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 21, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 15, 2021 | Sep. 28, 2020 | Jun. 15, 2020 | Apr. 20, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 4,000,000 |  |  |  |  |  |
Repurchases of common stock |  | $ 342,000,000 | $ 1,641,000,000 | $ 1,250,000,000 |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01 |  |  |  |  |
Proceeds from the issuance of common stock | $ 1,100,000,000 | $ 2,100,000,000 |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  | 6,000,000 |  |  |  |  |  |
Junior preferred stock outstanding (in shares) |  | 2 |  |  |  |  |  |
Junior preferred stock par value per share (in dollars per share) |  | $ 0.01 |  |  |  |  |  |
Preferred stock authorized to issue (in shares) |  | 250,000,000 |  |  |  |  |  |
Public Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Sale of common stock (in shares) | 43,000,000 |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  | $ 0.01 |
Share price (in dollars per share) | $ 26.50 |  |  |  |  |  |  |
Equity Distribution Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Sale of common stock (in shares) |  | 21,400,000 |  |  |  |  |  |
Share price (in dollars per share) |  | $ 46.70 |  |  |  |  |  |
Proceeds from the issuance of common stock |  | $ 989,000,000 |  |  |  |  |  |
Number of shares issuable under Equity Distribution Agreement (up to) (in shares) |  |  |  |  |  |  | 28,000,000 |
CARES Act Credit Agreement | Line of Credit |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 520,000,000 |  |
PSP Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of warrants issuable under agreement (up to) |  |  |  |  |  |  |  | 4,600,000
Number of warrants issuable under agreement (up to) |  | 4,800,000 |  |  |  |  |  | 2,300,000
Strike price (in dollars per share) |  | $ 31.50 |  |  |  |  |  |
Term of warrants |  | 5 years |  |  |  |  |  |
Fair value of warrants outstanding |  | $ 66,000,000 |  |  |  |  |  |
Credit Agreement Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of warrants issuable under agreement (up to) |  |  |  |  |  | 16,400,000 |  |
Number of warrants issuable under agreement (up to) |  |  |  |  |  | 1,700,000 |  |
Strike price (in dollars per share) |  |  |  |  |  | $ 31.50 |  |
Term of warrants |  |  |  |  |  | 5 years |  |
Fair value of warrants outstanding |  |  |  |  |  | $ 30,000,000 |  |
Amount of warrants issued as a percent of the principal amount of disbursements |  |  |  |  |  | 10.00% |  |
PSP2 Warrants | Subsequent Event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of warrants issuable under agreement (up to) |  |  |  |  | 1,700,000 |  |  |
Strike price (in dollars per share) |  |  |  |  | $ 43.26 |  |  |
Term of warrants |  |  |  |  | 5 years |  |  |

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