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Quarterly Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results |
As adjusted |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
($ in millions, except per share data) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Revenues |  | $ | 9,770 |  |  | $ | 9,644 |  |  | $ | 10,099 |  |  | $ | 9,813 |  |  | $ | 10,465 |  |  | $ | 9,888 |  |  | $ | 9,481 |  |  | $ | 10,062 |
Net income (loss) applicable to common shareholders |  | 977 |  |  | 785 |  |  | 678 |  |  | 549 |  |  | 942 |  |  | 810 |  |  | (585 | ) |  | 1,294 |
Earnings per common share - Basic |  | 2.76 |  |  | 2.15 |  |  | 1.94 |  |  | 1.51 |  |  | 2.72 |  |  | 2.24 |  |  | (1.71 | ) |  | 3.62 |
Earnings per common share - Diluted |  | 2.71 |  |  | 2.11 |  |  | 1.91 |  |  | 1.49 |  |  | 2.68 |  |  | 2.21 |  |  | (1.71 | ) |  | 3.56 |
Impact of change |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
($ in millions, except per share data) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Revenues |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Net income (loss) applicable to common shareholders |  | 31 |  |  | 119 |  |  | 41 |  |  | (1 | ) |  | 109 |  |  | 173 |  |  | (273 | ) |  | 74 |
Earnings per common share - Basic |  | 0.09 |  |  | 0.33 |  |  | 0.12 |  |  | — |  |  | 0.31 |  |  | 0.48 |  |  | (0.80 | ) |  | 0.21 |
Earnings per common share - Diluted |  | 0.08 |  |  | 0.32 |  |  | 0.11 |  |  | — |  |  | 0.31 |  |  | 0.47 |  |  | (0.80 | ) |  | 0.21 |

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- References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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