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Quarterly Results (unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results (unaudited) |
Note 21 | Quarterly Results (unaudited)
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
($ in millions, except per share data) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Revenues |  | $ | 10,990 |  |  | $ | 9,770 |  |  | $ | 11,144 |  |  | $ | 10,099 |  |  | $ | 11,069 |  |  | $ | 10,465 |  |  | $ | 11,472 |  |  | $ | 9,481 |
Net income (loss) applicable to common shareholders |  | 1,261 |  |  | 977 |  |  | 821 |  |  | 678 |  |  | 889 |  |  | 942 |  |  | 1,707 |  |  | (585 | )
Earnings per common share - Basic |  | 3.79 |  |  | 2.76 |  |  | 2.47 |  |  | 1.94 |  |  | 2.71 |  |  | 2.72 |  |  | 5.32 |  |  | (1.71 | )
Earnings per common share - Diluted |  | 3.74 |  |  | 2.71 |  |  | 2.44 |  |  | 1.91 |  |  | 2.67 |  |  | 2.68 |  |  | 5.23 |  |  | (1.71 | )
The Company changed its accounting principle for recognizing actuarial gains and losses and expected return on plan assets for its pension and other postretirement plans to a more preferable policy under U.S. GAAP. See Note 2 for discussion of the change in accounting principle and further information regarding the impact of the change on the consolidated financial statements.
Impact of change |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
($ in millions, except per share data) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Revenues |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Net income (loss) applicable to common shareholders |  | 5 |  |  | 31 |  |  | (69 | ) |  | 41 |  |  | (140 | ) |  | 109 |  |  | 240 |  |  | (273 | )
Earnings per common share - Basic |  | 0.01 |  |  | 0.09 |  |  | (0.21 | ) |  | 0.12 |  |  | (0.43 | ) |  | 0.31 |  |  | 0.75 |  |  | (0.80 | )
Earnings per common share - Diluted |  | 0.02 |  |  | 0.08 |  |  | (0.20 | ) |  | 0.11 |  |  | (0.42 | ) |  | 0.31 |  |  | 0.73 |  |  | (0.80 | )

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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