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Equity (Preferred Stock - Authorized, Issued and Outstanding) (Details) - $ / shares | Dec. 31, 2020 | Sep. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Preferred stock authorized (shares) | 20,000,000 |  | 20,000,000
Preferred stock outstanding (shares) | 36,000 |  | 41,000
Common stock held in treasury at cost (shares) | 119,000,000 |  | 109,000,000
Series B Preferred Stock |  |  |
Preferred stock, liquidation preference per share (in USD per share) | $ 40 |  |
Preferred stock outstanding (shares) | 1,000 |  | 1,000
Series O Preferred Stock |  |  |
Preferred stock, liquidation preference per share (in USD per share) | $ 100,000 |  |
Preferred stock outstanding (shares) | 10,000 |  | 10,000
Series P Preferred Stock |  |  |
Preferred stock, liquidation preference per share (in USD per share) | $ 100,000 |  |
Preferred stock outstanding (shares) | 15,000 |  | 15,000
Series Q Preferred Stock |  |  |
Preferred stock, liquidation preference per share (in USD per share) | $ 100,000 |  |
Preferred stock outstanding (shares) |  |  | 5,000
Treasury stock, preferred (shares) |  | 4,800 |
Series R Preferred Stock |  |  |
Preferred stock, liquidation preference per share (in USD per share) | $ 100,000 |  |
Preferred stock outstanding (shares) | 5,000 |  | 5,000
Series S Preferred Stock |  |  |
Preferred stock, liquidation preference per share (in USD per share) | $ 100,000 |  |
Preferred stock outstanding (shares) | 5,000 |  | 5,000
Depositary Shares |  |  |
Common stock held in treasury at cost (shares) |  | 19,200,000 |

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