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Quarterly Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
($ in millions, except per share data) |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Revenues |  | $ | 9,434 |  |  | $ | 8,871 |  |  | $ | 9,587 |  |  | $ | 9,164 |  |  | $ | 9,660 |  |  | $ | 9,221 |  |  | $ | 9,843 |  |  | $ | 9,278 |
Net income applicable to common shareholders |  | 666 |  |  | 217 |  |  | 550 |  |  | 242 |  |  | 637 |  |  | 491 |  |  | 1,220 |  |  | 811 |
Net income applicable to common shareholders earnings per common share - Basic |  | 1.82 |  |  | 0.57 |  |  | 1.51 |  |  | 0.65 |  |  | 1.76 |  |  | 1.32 |  |  | 3.41 |  |  | 2.20 |
Net income applicable to common shareholders earnings per common share - Diluted |  | 1.79 |  |  | 0.57 |  |  | 1.49 |  |  | 0.64 |  |  | 1.74 |  |  | 1.31 |  |  | 3.35 |  |  | 2.18 |

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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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