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Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basic and diluted: |  |  |  |  |  |  |  |
Net income | $ 1,654 |  | $ 1,359 |  | $ 4,911 |  | $ 3,954 |
Preferred dividends | (20) |  | (21) |  | (61) |  | (61) |
Net Income Loss Available to Common Shareholders | 1,634 |  | 1,338 |  | 4,850 |  | 3,893 |
Earnings allocated to participating share awards | (13) |  | (11) |  | (38) |  | (32) |
Net Income Attributable to Common Shareholders | $ 1,621 |  | $ 1,327 |  | $ 4,812 |  | $ 3,861 |
Denominator: |  |  |  |  |  |  |  |
Basic | 858.0 |  | 878.0 |  | 859.0 |  | 889.0 |
Add: Weighted-average stock options | 2.0 |  | 3.0 |  | 2.0 |  | 3.0 |
Diluted | 860.0 |  | 881.0 |  | 861.0 |  | 892.0 |
Earnings Per Common Share, Basic (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 1.89 | [1] | $ 1.51 | [1] | $ 5.6 | [2] | $ 4.34 | [2]
Earnings Per Common Share, Diluted (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 1.88 | [1] | $ 1.51 | [1] | $ 5.59 | [2] | $ 4.33 | [2]
Stock options [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per Share, amount | 0.7 |  | 0.5 |  | 0.7 |  | 0.8 |
[1] | Rep resents net income less (i) earnings allocated to participating share awards of $ 13 million and $ 11 million for the three months ended September 30 , 2018 and 2017 , respectively, and (ii) dividends on preferred shares of $ 20 million and $ 21 million for the three months ended September 30 , 2018 and 2017 , respectively .
[2] | Represents net income less (i) earnings allocated to participating share awards of $ 38 million and $ 32 million for the nine months ended September 30 , 2018 and 2017 , respectively, and (ii) dividends on preferred shares of $ 61 million for both the nine months ended September 30 , 2018 and 2017 .

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