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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quartertly Financial Data [Abstract] |
Quarterly financial data | QUARTERLY FINANCIAL DATA (UNAUDITED)
(Millions, except per share amounts) |  | 2017 |  | 2016
Quarters Ended |  |  | 12/31 |  |  | 9/30 |  |  | 6/30 |  |  | 3/31 |  |  | 12/31 |  |  | 9/30 |  |  | 6/30 |  |  | 3/31
Total revenues net of interest expense |  | $ | 8,839 |  | $ | 8,436 |  | $ | 8,307 |  | $ | 7,889 |  | $ | 8,022 |  | $ | 7,774 |  | $ | 8,235 |  | $ | 8,088
Pretax income |  |  | 1,821 |  |  | 1,827 |  |  | 1,949 |  |  | 1,817 |  |  | 1,161 |  |  | 1,735 |  |  | 3,016 |  |  | 2,184
Net income (loss) |  |  | (1,197) |  |  | 1,356 |  |  | 1,340 |  |  | 1,237 |  |  | 825 |  |  | 1,142 |  |  | 2,015 |  |  | 1,426
Earnings Per Common Share — Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income attributable to common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | shareholders(a) |  | $ | (1.41) |  | $ | 1.51 |  | $ | 1.47 |  | $ | 1.34 |  | $ | 0.88 |  | $ | 1.21 |  | $ | 2.11 |  | $ | 1.45
Earnings Per Common Share — Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income attributable to common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | shareholders(a) |  |  | (1.41) |  |  | 1.50 |  |  | 1.47 |  |  | 1.34 |  |  | 0.88 |  |  | 1.20 |  |  | 2.10 |  |  | 1.45
Cash dividends declared per common share |  |  | 0.35 |  |  | 0.35 |  |  | 0.32 |  |  | 0.32 |  |  | 0.32 |  |  | 0.32 |  |  | 0.29 |  |  | 0.29
Common share price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | High |  |  | 100.53 |  |  | 90.77 |  |  | 85.39 |  |  | 82.00 |  |  | 75.74 |  |  | 66.71 |  |  | 67.34 |  |  | 68.18
|  | Low |  | $ | 90.04 |  | $ | 83.33 |  | $ | 75.51 |  | $ | 74.74 |  | $ | 59.50 |  | $ | 58.25 |  | $ | 57.15 |  | $ | 50.27
Represents net income, less (i) earnings allocated to participating share awards of $2 million, $11 million, $11 million and $10 million for the quarters ended December 31, September 30, June 30 and March 31, 2017, respectively, and $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 (ii) dividend s on preferred shares of $20 million, $21 million, $19 million and $21 million for the quarters ended December 31, September 30, June 30 and March 31, 2017, respectively, and $19 million, $21 million, $19 million and $21 million for the quarters ended December 31, September 30, June 30 and March 31, 2016, 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=84173487&loc=d3e1280-108306 + Details
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