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v3.19.3.a.u2

Stockholders' Equity - Common Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 25 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 22, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Jul. 19, 2017 | Dec. 19, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |
Common share buy-back program, amount |  |  |  |  |  | $ 2,000 |
Value of shares repurchased |  | $ 2 | $ 273 | $ 250 | $ 525 |  |
Common share buy-back program, average price per share |  |  |  |  | $ 18.18 |  |
Per common share cash dividend declared for the period |  | $ 1.00 | $ 0.80 | $ 0.50 |  |  |
Per common share cash dividend paid in the period |  | $ 0.95 | $ 0.725 | $ 0.50 |  |  |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Per common share cash dividend declared for the period | $ 0.25 |  |  |  |  |  |
Equity distribution agreement | Class P |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Value of Stock Available for Sale Under Equity Distribution Agreement |  |  |  |  |  |  | $ 5,000
Share issued (in shares) |  | 0 | 0 | 0 |  |  |
Common stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased |  | 100,000 | 15,000,000 | 14,000,000 | 29,000,000 |  |

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