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Quarterly Financial Data (Unaudited) (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Disclosure of quarterly financial data |  |  |  |  |  |  |  |  |  |  |  |
Total revenues net of interest expense | $ |  | $ 8,022,000,000 | $ 7,774,000,000 | $ 8,235,000,000 | $ 8,088,000,000 | $ 8,391,000,000 | $ 8,193,000,000 | $ 8,284,000,000 | $ 7,950,000,000 | $ 32,119,000,000 | $ 32,818,000,000 | $ 34,188,000,000
Pretax income | $ |  | 1,161,000,000 | 1,735,000,000 | 3,016,000,000 | 2,184,000,000 | 1,454,000,000 | 1,938,000,000 | 2,230,000,000 | 2,316,000,000 | 8,096,000,000 | 7,938,000,000 | 8,991,000,000
Net income | $ |  | $ 825,000,000 | $ 1,142,000,000 | $ 2,015,000,000 | $ 1,426,000,000 | $ 899,000,000 | $ 1,266,000,000 | $ 1,473,000,000 | $ 1,525,000,000 | $ 5,408,000,000 | $ 5,163,000,000 | $ 5,885,000,000
Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ / shares | [1] |  |  |  |  |  |  |  |  | $ 5.67 | $ 5.07 | $ 5.58
Net income attributable to common shareholders | $ / shares |  | $ 0.88 | $ 1.21 | $ 2.11 | $ 1.45 | $ 0.89 | $ 1.24 | $ 1.43 | $ 1.49 |  |  |
Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |  |
Diluted | $ / shares |  |  |  |  |  |  |  |  |  | 5.65 | 5.05 | 5.56
Net income attributable to common shareholders | $ / shares |  | 0.88 | 1.2 | 2.1 | 1.45 | 0.89 | 1.24 | 1.42 | 1.48 |  |  |
Cash dividends declared per common share | $ / shares |  | $ 0.32 | $ 0.32 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.26 | $ 1.22 | $ 1.13 | $ 1.01
Common share price: |  |  |  |  |  |  |  |  |  |  |  |
High | $ |  | 75.74 | 66.71 | 67.34 | 68.18 | 77.85 | 81.66 | 81.92 | 93.94 |  |  |
Low | $ |  | 59.5 | 58.25 | 57.15 | 50.27 | 67.57 | 71.71 | 76.53 | 77.12 |  |  |
[1] | Represents net income less (i) earnings allocated to participating share awards of $ 43 million, $ 38 million and $ 46 million for the years ended December 31, 2016 , 2015 and 2014 , respectively, and (ii) dividends on preferred shares of $ 80 million , $ 62 million and nil for the years ended December 31, 2016 , 2015 and 2014 , respectively .

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