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Common Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2019 | Jan. 02, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 19, 2017 | May 25, 2017 | May 24, 2017 | Jun. 12, 2015 | Dec. 19, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 2,000 |  |  |  |
Stock Repurchased During Period, Value |  |  | $ 273 | $ 250 |  |  |  |  |  |
Dividends Per Common Share Declared for the Period |  |  | $ 0.8 | $ 0.5 | $ 0.5 |  |  |  |  |
Warrant Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 100 |
Unexercised Warrants |  |  |  |  |  |  | 293,000,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  | $ 40 |  |
Class P |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Per Common Share Declared for the Period |  |  | 0.80 | 0.50 | 0.50 |  |  |  |  |
Per common share cash dividend paid in the period |  |  | $ 0.725 | $ 0.50 | $ 0.50 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value |  | $ 2 |  |  |  |  |  |  |  |
Dividends Per Common Share Declared for the Period | $ 0.20 |  |  |  |  |  |  |  |  |
Equity distribution agreement [Member] | 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] |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  | 15,000,000 | 14,000,000 |  |  |  |  |  |
Common stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  | 100,000 |  |  |  |  |  |  |  |

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