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Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basic and diluted: |  |  |  |  |  |  |  |
Net income | $ 1,755 |  | $ 1,654 |  | $ 5,066 |  | $ 4,911 |
Preferred dividends | (21) |  | (20) |  | (61) |  | (61) |
Net income available to common shareholders | 1,734 |  | 1,634 |  | 5,005 |  | 4,850 |
Earnings allocated to participating share awards | (11) |  | (13) |  | (35) |  | (38) |
Net Income Attributable to Common Shareholders | $ 1,723 |  | $ 1,621 |  | $ 4,970 |  | $ 4,812 |
Denominator: |  |  |  |  |  |  |  |
Basic: Weighted-average common stock (in shares) | 825,000,000 |  | 858,000,000 |  | 833,000,000 |  | 859,000,000 |
Add: Weighted-average stock options (in shares) | 2,000,000 |  | 2,000,000 |  | 2,000,000 |  | 2,000,000 |
Diluted (in shares) | 827,000,000 |  | 860,000,000 |  | 835,000,000 |  | 861,000,000 |
Basic EPS (in dollars per share) | $ 2.09 | [1] | $ 1.89 | [1] | $ 5.97 | [2] | $ 5.60 | [2]
Diluted EPS (in dollars per share) | $ 2.08 | [1] | $ 1.88 | [1] | $ 5.95 | [2] | $ 5.59 | [2]
Stock options [Member] |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |
The dilutive effect of securities excluded from the calculation of earnings per share (in shares) | 0 |  | 700,000 |  | 300,000 |  | 700,000 |
[1] | Represents net income less (i) earnings allocated to participating share awards of $11 million and $13 million for the three months ended September 30, 2019 and 2018, respectively, and (ii) dividends on preferred shares of $21 million and $20 million for the three months ended September 30, 2019 and 2018, respectively.
[2] | Represents net income less (i) earnings allocated to participating share awards of $35 million and $38 million for the nine months ended September 30, 2019 and 2018, respectively, and (ii) dividends on preferred shares of $61 million for both the nine months ended September 30, 2019 and 2018.

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