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Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Basic and diluted: |  |  |  |  |  |  |  |
Net income | $ 1,473 |  | $ 1,529 |  | $ 2,998 |  | $ 2,961 |
Preferred Dividends | (20) |  | 0 |  | (20) |  | 0 |
Net income available to common shareholders, basic | 1,453 |  | 1,529 |  | 2,978 |  | 2,961 |
Net income available to common shareholders, diluted | 1,453 |  | 1,529 |  | 2,978 |  | 2,961 |
Earnings allocated to participating share awards | (11) |  | (12) |  | (22) |  | (24) |
Net income attributable to common shareholders | $ 1,442 |  | $ 1,517 |  | $ 2,956 |  | $ 2,937 |
Denominator: |  |  |  |  |  |  |  |
Basic | 1,009,000,000 | [1] | 1,052,000,000 | [1] | 1,013,000,000 | [2] | 1,056,000,000 | [2]
Add: Weighted-average stock options | 4,000,000 |  | 6,000,000 |  | 5,000,000 |  | 6,000,000 |
Diluted | 1,013,000,000 | [1] | 1,058,000,000 | [1] | 1,018,000,000 | [2] | 1,062,000,000 | [2]
Earnings Per Common Share, Basic [Abstract] |  |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ 1.43 | [1] | $ 1.44 | [1] | $ 2.92 | [2] | $ 2.78 | [2]
Earnings Per Common Share, Diluted [Abstract] |  |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ 1.42 | [1] | $ 1.43 | [1] | $ 2.9 | [2] | $ 2.77 | [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 | 600,000 |  | 200,000 |  | 500,000 |  | 200,000 |
[1] | Represents net income less ( i ) earnings allocated to participating share awards of $ 11 million and $ 12 million for the three months ended June 30, 2015 and 2014 , respect ively, and (ii) dividends on preferred shares of $20 million and nil for the three months ended June 30, 2015
[2] | Represents net income less ( i ) earnings allocate d to participating share awards of $ 22 million and $ 24 million for the six months ended June 30 , 2015 and 2014 , respectively, and (ii) di vidends on preferred shares of $20 million and nil for the six months ended June 30, 2015 and 2014, respectively.

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