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Statements of Consolidated Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock, Dividends, Per Share, Declared | $ 0.84 | $ 0.80 | $ 0.78
Preferred Stock, Dividends Per Share, Declared |  |  | 28.88
Series A Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 56.50 | 56.50 | 28.88
Preferred Stock, Liquidation Preference, Value | $ 400 |  |
Series B Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,625.00 | $ 1,674.65 | $ 0
Preferred Stock, Liquidation Preference, Value | $ 500 |  |

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