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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quartertly Financial Data [Abstract] |
Quarterly financial data |
(Millions, except per share amounts) |  | 2015 |  | 2014
Quarters Ended |  |  | 12/31 |  |  | 9/30 |  |  | 6/30 |  |  | 3/31 |  |  | 12/31 |  |  | 9/30 |  |  | 6/30 |  |  | 3/31
Total revenues net of interest expense |  | $ | 8,391 |  | $ | 8,193 |  | $ | 8,284 |  | $ | 7,950 |  | $ | 9,081 |  | $ | 8,303 |  | $ | 8,631 |  | $ | 8,173
Pretax income |  |  | 1,454 |  |  | 1,938 |  |  | 2,230 |  |  | 2,316 |  |  | 2,225 |  |  | 2,246 |  |  | 2,312 |  |  | 2,208
Net income |  |  | 899 |  |  | 1,266 |  |  | 1,473 |  |  | 1,525 |  |  | 1,447 |  |  | 1,477 |  |  | 1,529 |  |  | 1,432
Earnings Per Common Share — Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income attributable to common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | shareholders(a) |  | $ | 0.89 |  | $ | 1.24 |  | $ | 1.43 |  | $ | 1.49 |  | $ | 1.40 |  | $ | 1.41 |  | $ | 1.44 |  | $ | 1.34
Earnings Per Common Share — Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income attributable to common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | shareholders(a) |  |  | 0.89 |  |  | 1.24 |  |  | 1.42 |  |  | 1.48 |  |  | 1.39 |  |  | 1.40 |  |  | 1.43 |  |  | 1.33
Cash dividends declared per common share |  |  | 0.29 |  |  | 0.29 |  |  | 0.29 |  |  | 0.26 |  |  | 0.26 |  |  | 0.26 |  |  | 0.26 |  |  | 0.23
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
Represents net income, less (i) earnings allocated to participating share awards of $6 million, $10 million, $11 million and $11 million for the quarter s ended December 31, September 30, June 30 and March 31, 2015, respectively, and $11 million, $11 million, $12 million and $12 million for the quarter s ended December 31, September 30, June 30 and March 31, 2014, respectively, and (ii) dividend s on preferred shares of $20 million, $22 million and $20 million, for the quarter s ended December 31, September 30 and June 30, 2015, respectively, and nil for all other comparative periods.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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