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Quarterly Results (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results (Unaudited) | 21. QUARTERLY RESULTS (UNAUDITED) Current and Historical Quarterly Results of the Company
| Three months ended
| March 31, |  | June 30, |  | September 30, |  | December 31,
| 2018 | 2017 |  | 2018 | 2017 |  | 2018 | 2017 |  | 2018 | 2017
Revenues | $ | 4,691 |  | $ | 4,169 |  |  | $ | 4,789 |  | $ | 4,214 |  |  | $ | 4,842 |  | $ | 4,192 |  |  | $ | 4,633 |  | $ | 4,587 |
Benefits, losses and expenses | 4,172 |  | 3,768 |  |  | 4,252 |  | 4,495 |  |  | 4,312 |  | 4,011 |  |  | 4,466 |  | 4,165 |
Income (loss) from continuing operations, net of tax | 428 |  | 303 |  |  | 434 |  | (152 | ) |  | 427 |  | 145 |  |  | 196 |  | (558 | )
Income (loss) from discontinued operations, net of tax | 169 |  | 75 |  |  | 148 |  | 112 |  |  | 5 |  | 89 |  |  | — |  | (3,145 | )
Net income (loss) | $ | 597 |  | $ | 378 |  |  | $ | 582 |  | $ | (40 | ) |  | $ | 432 |  | $ | 234 |  |  | $ | 196 |  | $ | (3,703 | )
Less: Preferred stock dividends | — |  | — |  |  | — |  | — |  |  | — |  | — |  |  | 6 |  | — |
Net income (loss) available to common stockholders | $ | 597 |  | $ | 378 |  |  | $ | 582 |  | $ | (40 | ) |  | $ | 432 |  | $ | 234 |  |  | $ | 190 |  | $ | (3,703 | )
Basic |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax, available to common stockholders per share | $ | 1.20 |  | $ | 0.82 |  |  | $ | 1.21 |  | $ | (0.42 | ) |  | $ | 1.19 |  | $ | 0.40 |  |  | $ | 0.53 |  | $ | (1.56 | )
Income (loss) from discontinued operations, net of tax per share | $ | 0.47 |  | $ | 0.20 |  |  | $ | 0.41 |  | $ | 0.31 |  |  | $ | 0.01 |  | $ | 0.25 |  |  | $ | — |  | $ | (8.81 | )
Net income (loss) per common share available to common stockholders | $ | 1.67 |  | $ | 1.02 |  |  | $ | 1.62 |  | $ | (0.11 | ) |  | $ | 1.20 |  | $ | 0.65 |  |  | $ | 0.53 |  | $ | (10.37 | )
Diluted |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax, available to common stockholders per share | $ | 1.18 |  | $ | 0.80 |  |  | $ | 1.19 |  | $ | (0.42 | ) |  | $ | 1.17 |  | $ | 0.40 |  |  | $ | 0.52 |  | $ | (1.56 | )
Income (loss) from discontinued operations, net of tax per share | $ | 0.46 |  | $ | 0.20 |  |  | $ | 0.41 |  | $ | 0.31 |  |  | $ | 0.02 |  | $ | 0.24 |  |  | $ | — |  | $ | (8.81 | )
Net income (loss) per common share available to common stockholders | $ | 1.64 |  | $ | 1.00 |  |  | $ | 1.60 |  | $ | (0.11 | ) |  | $ | 1.19 |  | $ | 0.64 |  |  | $ | 0.52 |  | $ | (10.37 | )
Weighted average common shares outstanding, basic | 357.5 |  | 371.4 |  |  | 358.3 |  | 366.0 |  |  | 358.6 |  | 360.2 |  |  | 359.1 |  | 357.0 |
Weighted average shares outstanding and dilutive potential common shares [1] | 363.9 |  | 378.6 |  |  | 364.2 |  | 366.0 |  |  | 364.1 |  | 367.0 |  |  | 364.0 |  | 357.0 |
[1] In periods where a loss from continuing operations, net of tax, available to common stockholders or net loss available to common stockholders is recognized, inclusion of incremental dilutive shares would be antidilutive. Due to the antidilutive impact, such shares are excluded from the diluted earnings per share calculation of income (loss) from continuing operations, net of tax, available to common stockholders and net income (loss) available to common stockholders in such periods.

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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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