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Total Equity and Other Comprehensive Income (Dividends Per Share) (Details) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2021 $ / shares | Sep. 13, 2021 $ / shares shares | Sep. 30, 2021 $ / shares shares | Sep. 30, 2020 $ / shares | Sep. 30, 2021 $ / shares shares | Sep. 30, 2020 $ / shares | Dec. 31, 2020 shares | Sep. 01, 2020 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Depositary shares conversion ratio |  | 0.01 |  |  |  |  |  |
Common stock held in treasury at cost (shares) | shares |  |  | 120,000,000 |  | 120,000,000 |  | 119,000,000 |
Subsequent Event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, common, per share (in dollars per share) | $ 1.25 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, common, per share (in dollars per share) |  |  | $ 1.25 | $ 1.15 | $ 3.55 | $ 3.45 |  |
Series B |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  | 0.45 | 0.45 | 1.35 | 1.35 |  |
Series O |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  | 3,375 | 3,375 | 6,750 | 6,750 |  |
Series P |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  | $ 1,531 | 1,531 | 4,594 | 4,594 |  |
Series Q |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  |  | 1,343 |  | 4,031 |  |
Treasury stock, preferred (shares) | shares |  |  |  |  |  |  |  | 4,800
Common stock held in treasury at cost (shares) | shares |  |  |  |  |  |  |  | 19,200,000
Series R |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  |  |  | 2,425 | 2,425 |  |
Series S |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  |  |  | $ 2,500 | $ 2,500 |  |
Depositary Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock held in treasury at cost (shares) | shares |  |  |  |  |  |  |  | 19,200,000
Series T Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock activity (shares) | shares |  | 1,500,000 |  |  |  |  |  |
Fixed interest rate |  | 3.40% |  |  |  |  |  |
Preferred stock, par or stated value per share (in dollars per share) |  | $ 1 |  |  |  |  |  |

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