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Common Stockholders' Equity and Preferred Securities - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Mar. 03, 2021 | Jun. 15, 2020
Class of Stock [Line Items] |  |  |  |
Warrants issued | $ 99 | $ 97 |  |
Proceeds from the issuance of common stock |  | $ 1,100 |  |
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 |  |  |
2020 ATM Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of common stock (in shares) |  | 21,000,000 |  |
Share price (in dollars per share) |  | $ 46.70 |  |
Proceeds from the issuance of common stock |  | $ 989 |  |
Public Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of common stock (in shares) |  | 43,000,000 |  |
Share price (in dollars per share) |  | $ 26.50 |  |
Equity Distribution Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of common stock (in shares) | 7,000,000 |  |  |
Share price (in dollars per share) | $ 42.98 |  |  |
Proceeds from the issuance of common stock | $ 282 |  |  |
Number of shares issuable under Equity Distribution Agreement (up to) (in shares) |  |  |  | 28,000,000
2021 ATM Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of common stock (in shares) | 4,000,000 |  |  |
Share price (in dollars per share) | $ 57.50 |  |  |
Proceeds from the issuance of common stock | $ 250 |  |  |
Number of shares issuable under Equity Distribution Agreement (up to) (in shares) |  |  | 37,000,000 |
Payroll Support Program 2 & 3 (PSP 2 & 3) Warrants |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of warrants issuable under agreement (up to) | 3,500,000 |  |  |
Warrants issued | $ 99 |  |  |

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