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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Basic and diluted: |  |  |  |  |  |  |  |
Net income | $ 1,142.0 |  | $ 1,266.0 |  | $ 4,583.0 |  | $ 4,264.0 |
Preferred dividends | (21.0) |  | (22.0) |  | (61.0) |  | (42.0) |
Net income available to common stockholders - basic | 1,121.0 |  | 1,244.0 |  | 4,522.0 |  | 4,222.0 |
Net income available to common stockholders - diluted | 1,121.0 |  | 1,244.0 |  | 4,522.0 |  | 4,222.0 |
Earnings allocated to participating share awards | (9.0) |  | (10.0) |  | (37.0) |  | (32.0) |
Net income attributable to common shareholders | $ 1,112.0 |  | $ 1,234.0 |  | $ 4,485.0 |  | $ 4,190.0 |
Denominator: |  |  |  |  |  |  |  |
Basic | 920.0 |  | 994.0 |  | 940.0 |  | 1,007.0 |
Add: Weighted-average stock options | 3.0 |  | 3.0 |  | 3.0 |  | 4.0 |
Diluted | 923.0 |  | 997.0 |  | 943.0 |  | 1,011.0 |
Earnings Per Common Share, Basic (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 1.21 | [1] | $ 1.24 | [1] | $ 4.77 | [2] | $ 4.16 | [2]
Earnings Per Common Share, Diluted (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 1.2 | [3] | $ 1.24 | [3] | $ 4.76 | [4] | $ 4.15 | [4]
Earnings Per Common Share (Textuals) [Abstract] |  |  |  |  |  |  |  |
Subordinated debentures | $ 750.0 |  |  |  | $ 750.0 |  |  |
Subordinated debt issuance year | 2006 |  |  |  |  |  |  |
Subordinated debt maturity year | 2036 |  |  |  |  |  |  |
Stock options [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per Share, amount | 3.2 |  | 0.6 |  | 2.2 |  | 0.5 |
[1] | Represents net income less (i) earnings allocated to participating share awards of $ 9 million and $ 10 million for the three months ended September 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 21 million and $ 22 million for the three months ended September 30 , 2016 and 2015 , respectively.
[2] | Represents net income less (i) earnings allocate d to participating share awards of $ 37 million and $ 32 million for the nine months ended September 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 61 million and $ 42 million for the nine months ended September 30 , 2016 and 2015 , respectively.
[3] | Represents net income less (i) earnings allocated to participating share awards of $ 9 million and $ 10 million for the three months ended September 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 21 million and $ 22 million for the three months ended September 30 , 2016 and 2015 , respectively.
[4] | Represents net income less (i) earnings allocate d to participating share awards of $ 37 million and $ 32 million for the nine months ended September 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 61 million and $ 42 million for the nine months ended September 30 , 2016 and 2015 , respectively.

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