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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quartertly Financial Data [Abstract] |
Quarterly financial data |
(Millions, except per share amounts) |  | 2016 |  | 2015
Quarters Ended |  |  | 12/31 |  |  | 9/30 |  |  | 6/30 |  |  | 3/31 |  |  | 12/31 |  |  | 9/30 |  |  | 6/30 |  |  | 3/31
Total revenues net of interest expense |  | $ | 8,022 |  | $ | 7,774 |  | $ | 8,235 |  | $ | 8,088 |  | $ | 8,391 |  | $ | 8,193 |  | $ | 8,284 |  | $ | 7,950
Pretax income |  |  | 1,161 |  |  | 1,735 |  |  | 3,016 |  |  | 2,184 |  |  | 1,454 |  |  | 1,938 |  |  | 2,230 |  |  | 2,316
Net income |  |  | 825 |  |  | 1,142 |  |  | 2,015 |  |  | 1,426 |  |  | 899 |  |  | 1,266 |  |  | 1,473 |  |  | 1,525
Earnings Per Common Share — Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income attributable to common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | shareholders(a) |  | $ | 0.88 |  | $ | 1.21 |  | $ | 2.11 |  | $ | 1.45 |  | $ | 0.89 |  | $ | 1.24 |  | $ | 1.43 |  | $ | 1.49
Earnings Per Common Share — Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income attributable to common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | shareholders(a) |  |  | 0.88 |  |  | 1.20 |  |  | 2.10 |  |  | 1.45 |  |  | 0.89 |  |  | 1.24 |  |  | 1.42 |  |  | 1.48
Cash dividends declared per common share |  |  | 0.32 |  |  | 0.32 |  |  | 0.29 |  |  | 0.29 |  |  | 0.29 |  |  | 0.29 |  |  | 0.29 |  |  | 0.26
Common share price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | High |  |  | 75.74 |  |  | 66.71 |  |  | 67.34 |  |  | 68.18 |  |  | 77.85 |  |  | 81.66 |  |  | 81.92 |  |  | 93.94
|  | Low |  | $ | 59.50 |  | $ | 58.25 |  | $ | 57.15 |  | $ | 50.27 |  | $ | 67.57 |  | $ | 71.71 |  | $ | 76.53 |  | $ | 77.12
Represents net income, less (i) earnings allocated to participating share awards of $6 million, $9 million, $17 million and $11 million for the quarters ended December 31, September 30, June 30 and March 31, 2016, respectively, and $6 million, $10 million, $11 million and $11 million for the quarters ended December 31, September 30, June 30 and March 31, 2015, respectively, and (ii) dividend s on preferred shares of $19 million, $21 million, $19 million and $21 million for the quarters ended December 31, September 30, June 30 and March 31, 2016, respectively, and $20 million, $22 million, $20 million and nil for the quarters ended December 31, September 30, June 30 and March 31, 2015, respectively.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, 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=68076893&loc=d3e1280-108306 + Details
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