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Quarterly Financial Data (Unaudited) (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Sep. 30, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Mar. 31, 2014 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares
Disclosure of quarterly financial data |  |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense | $ |  | $ 8,391,000,000 | $ 8,193,000,000 | $ 8,284,000,000 | $ 7,950,000,000 | $ 9,081,000,000 | $ 8,303,000,000 | $ 8,631,000,000 | $ 8,173,000,000 | $ 32,818,000,000 | $ 34,188,000,000 | $ 32,870,000,000
Pretax income | $ |  | 1,454,000,000 | 1,938,000,000 | 2,230,000,000 | 2,316,000,000 | 2,225,000,000 | 2,246,000,000 | 2,312,000,000 | 2,208,000,000 | 7,938,000,000 | 8,991,000,000 | 7,888,000,000
Net income | $ |  | $ 899,000,000 | $ 1,266,000,000 | $ 1,473,000,000 | $ 1,525,000,000 | $ 1,447,000,000 | $ 1,477,000,000 | $ 1,529,000,000 | $ 1,432,000,000 | $ 5,163,000,000 | $ 5,885,000,000 | $ 5,359,000,000
Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ / shares | [1] |  |  |  |  |  |  |  |  | $ 5.07 | $ 5.58 | $ 4.91
Net income attributable to common shareholders | $ / shares |  | $ 0.89 | $ 1.24 | $ 1.43 | $ 1.49 | $ 1.4 | $ 1.41 | $ 1.44 | $ 1.34 |  |  |
Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Diluted | $ / shares |  |  |  |  |  |  |  |  |  | 5.05 | 5.56 | 4.88
Net income attributable to common shareholders | $ / shares |  | 0.89 | 1.24 | 1.42 | 1.48 | 1.39 | 1.4 | 1.43 | 1.33 |  |  |
Cash dividends declared per common share | $ / shares |  | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.23 | $ 1.13 | $ 1.01 | $ 0.89
Common share price: |  |  |  |  |  |  |  |  |  |  |  |
High | $ |  | 77.85 | 81.66 | 81.92 | 93.94 | 94.89 | 96.24 | 96.04 | 94.35 |  |  |
Low | $ |  | 67.57 | 71.71 | 76.53 | 77.12 | 78.41 | 85.75 | 83.99 | 82.63 |  |  |
[1] | Represents net income less ( i ) earnings allocated to participating share awards of $ 38 million, $ 46 million and $ 47 million for the years ended December 31, 2015 , 2014 and 2013 , respectively , and (ii) dividends on preferred shares of $ 62 million for the year ended December 31, 2015 , and nil f or the years ended December 31, 2014 and 2013 .

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