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Total Equity and Other Comprehensive Income (Dividends per Share) (Details) - $ / shares | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Sep. 01, 2020
Class of Stock [Line Items] |  |  |  |  |  |
Common stock held in treasury at cost (shares) | 118,000,000 |  | 118,000,000 |  | 119,000,000 |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared, Common, per share (in dollars per share) | $ 1.15 | $ 1.15 | $ 2.30 | $ 2.30 |  |
Series B |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) | 0.45 | 0.45 | 0.90 | 0.90 |  |
Series O |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  | 3,375 | 3,375 |  |
Series P |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) | 1,532 | 1,532 | 3,063 | 3,063 |  |
Series Q |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  | 1,344 |  | 2,688 |  |
Treasury stock, preferred (shares) |  |  |  |  |  | 4,800
Series R |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) | 2,425 | 2,425 | 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 | $ 2,500 | $ 2,500 |  |
Depositary Shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock held in treasury at cost (shares) |  |  |  |  |  | 19,200,000

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