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Total Equity and Other Comprehensive Income (Dividends per Share) (Details) - $ / shares |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 01, 2020
Class of Stock [Line Items] |  |  |  |  |
Common stock held in treasury at cost (shares) |  | 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 |  |
Common Stock | Subsequent Event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cash dividends declared, Common, per share (in dollars per share) | $ 1.15 |  |  |  |
Series B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  | 0.45 | 0.45 |  |
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) |  | $ 1,531 | 1,531 |  |
Series Q |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cash dividends declared, Preferred, per share (in dollars per share) |  |  | $ 1,344 |  |
Treasury stock, preferred (shares) |  |  |  |  | 4,800
Depositary Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock held in treasury at cost (shares) |  |  |  |  | 19,200,000

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