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Quarterly Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly results |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
($ in millions, except per share data) |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Revenues |  | $ | 10,076 |  |  | $ | 10,990 |  |  | $ | 11,197 |  |  | $ | 11,144 |  |  | $ | 11,500 |  |  | $ | 11,069 |  |  | $ | 12,018 |  |  | $ | 11,472 |
Net income (loss) applicable to common shareholders |  | 513 |  |  | 1,261 |  |  | 1,224 |  |  | 821 |  |  | 1,126 |  |  | 889 |  |  | 2,598 |  |  | 1,707 |
Earnings per common share - Basic |  | 1.62 |  |  | 3.79 |  |  | 3.90 |  |  | 2.47 |  |  | 3.62 |  |  | 2.71 |  |  | 8.54 |  |  | 5.32 |
Earnings per common share - Diluted |  | 1.59 |  |  | 3.74 |  |  | 3.86 |  |  | 2.44 |  |  | 3.58 |  |  | 2.67 |  |  | 8.45 |  |  | 5.23 |

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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=121640914&loc=d3e1280-108306 + Details
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