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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Basic and diluted: |  |  |  |  |  |  |  |
Net income | $ 2,015.0 |  | $ 1,473.0 |  | $ 3,441.0 |  | $ 2,998.0 |
Preferred dividends | (19.0) |  | (20.0) |  | (40.0) |  | (20.0) |
Net income available to common stockholders - basic | 1,996.0 |  | 1,453.0 |  | 3,401.0 |  | 2,978.0 |
Net income available to common stockholders - diluted | 1,996.0 |  | 1,453.0 |  | 3,401.0 |  | 2,978.0 |
Earnings allocated to participating share awards | (17.0) |  | (11.0) |  | (28.0) |  | (22.0) |
Net income attributable to common shareholders | $ 1,979.0 |  | $ 1,442.0 |  | $ 3,373.0 |  | $ 2,956.0 |
Denominator: |  |  |  |  |  |  |  |
Basic | 938.0 |  | 1,009.0 |  | 949.0 |  | 1,013.0 |
Add: Weighted-average stock options | 3.0 |  | 4.0 |  | 3.0 |  | 5.0 |
Diluted | 941.0 |  | 1,013.0 |  | 952.0 |  | 1,018.0 |
Earnings Per Common Share, Basic (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 2.11 | [1] | $ 1.43 | [1] | $ 3.55 | [2] | $ 2.92 | [2]
Earnings Per Common Share, Diluted (Note 15) [Abstract] |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 2.1 | [3] | $ 1.42 | [3] | $ 3.54 | [4] | $ 2.9 | [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 | 2.5 |  | 0.6 |  | 1.7 |  | 0.5 |
[1] | Represents net income less ( i ) earnings allocated to participating share awards of $ 17 million and $ 11 million for the three months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 19 million and $ 20 million for the three months ended June 30 , 2016 and 2015 , respectively.
[2] | Represents net income less ( i ) earnings allocate d to participating share awards of $ 28 million and $ 22 million for the six months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 40 million and $ 20 million for the six months ended June 30 , 2016 and 2015 , respectively.
[3] | Represents net income less ( i ) earnings allocated to participating share awards of $ 17 million and $ 11 million for the three months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 19 million and $ 20 million for the three months ended June 30 , 2016 and 2015 , respectively.
[4] | Represents net income less ( i ) earnings allocate d to participating share awards of $ 28 million and $ 22 million for the six months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 40 million and $ 20 million for the six months ended June 30 , 2016 and 2015 , respectively.

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