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Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basic and diluted: |  |  |  |  |  |  |  |
Net income | $ 1,623.0 |  | $ 1,344.0 |  | $ 3,257.0 |  | $ 2,595.0 |
Preferred dividends | (20.0) |  | (19.0) |  | (41.0) |  | (40.0) |
Net Income Loss Available to Common Shareholders | 1,603.0 |  | 1,325.0 |  | 3,216.0 |  | 2,555.0 |
Net income attributable to common shareholders | 1,603.0 |  | 1,325.0 |  | 3,216.0 |  | 2,555.0 |
Earnings allocated to participating share awards | (12.0) |  | (11.0) |  | (25.0) |  | (21.0) |
Net Income Attributable to Common Shareholders | $ 1,591.0 |  | $ 1,314.0 |  | $ 3,191.0 |  | $ 2,534.0 |
Denominator: |  |  |  |  |  |  |  |
Basic | 860.0 |  | 890.0 |  | 859.0 |  | 895.0 |
Add: Weighted-average stock options | 2.0 |  | 3.0 |  | 3.0 |  | 3.0 |
Diluted | 862.0 |  | 893.0 |  | 862.0 |  | 898.0 |
Earnings Per Common Share, Basic (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 1.85 | [1] | $ 1.48 | [1] | $ 3.71 | [2] | $ 2.83 | [2]
Earnings Per Common Share, Diluted (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 1.84 | [1] | $ 1.47 | [1] | $ 3.7 | [2] | $ 2.82 | [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 |  | 1.2 |  | 0.7 |  | 1.2 |
[1] | Rep resents net income less (i) earnings allocated to participating share awards of $ 12 million and $ 11 million for the three months ended June 30 , 2018 and 2017 , respectively, and (ii) dividends on preferred shares of $ 20 million and $ 19 million for the three months ended June 30 , 2018 and 2017 , respectively .
[2] | Represents net income less (i) earnings allocated to participating share awards of $ 25 million and $ 21 million for the six months ended June 30 , 2018 and 2017 , respectively, and (ii) dividends on preferred shares of $ 41 million and $ 40 million for the six months ended June 30 , 2018 and 2017 , respectively .

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