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Equity Dividends per Share (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common stock |  |  |
Class of Stock [Line Items] |  |  |
Common Stock, Dividends (in USD per share) | $ 4.60 | $ 4.20 | $ 3.40
Series B Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividends (in USD per share) | 1.80 | 1.80 | 1.80
Series O Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividends (in USD per share) | 6,750 | 6,750 | 6,750
Series P Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividends (in USD per share) | 6,125 | 6,125 | 6,125
Series Q Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividends (in USD per share) | 4,031 | 5,375 | 5,375
Series R Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividends (in USD per share) | 4,850 | 4,850 | 4,850
Series S Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividends (in USD per share) | $ 5,000 | $ 5,000 | $ 5,000

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