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Schedule II - Condensed Financial Information of Registrant - Statement of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 3,240 | $ 3,401 | $ 3,042
Realized capital gains and losses |  |  |  |  |  |  |  |  | (877) | 445 | (90)
Other income |  |  |  |  |  |  |  |  | 939 | 883 | 865
Total revenues | $ 9,481 | $ 10,465 | $ 10,099 | $ 9,770 | $ 10,062 | $ 9,888 | $ 9,813 | $ 9,644 | 39,815 | 39,407 | 37,399
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 332 | 335 | 295
Pension and other postretirement remeasurement gains and losses |  |  |  |  |  |  |  |  | 468 | (217) | 270
Other operating expenses |  |  |  |  |  |  |  |  | 5,594 | 5,196 | 4,846
Total costs and expenses |  |  |  |  |  |  |  |  | 37,193 | 34,878 | 34,754
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 468 | 995 | 842
Net income |  |  |  |  |  |  |  |  | 2,160 | 3,554 | 1,808
Preferred stock dividends |  |  |  |  |  |  |  |  | 148 | 116 | 116
Net income applicable to common shareholders | $ (585) | $ 942 | $ 678 | $ 977 | $ 1,294 | $ 810 | $ 549 | $ 785 | 2,012 | 3,438 | 1,692
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  |  |  |
Unrealized net capital gains and losses |  |  |  |  |  |  |  |  | (754) | 319 | 433
Unrealized foreign currency translation adjustments |  |  |  |  |  |  |  |  | (48) | 45 | 9
Unamortized pension and other postretirement prior service credit |  |  |  |  |  |  |  |  | (59) | (52) | (33)
Other comprehensive (loss) income, after-tax |  |  |  |  |  |  |  |  | (861) | 312 | 409
Comprehensive income |  |  |  |  |  |  |  |  | 1,299 | 3,866 | 2,217
Allstate Corporation |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 25 | 10 | 11
Realized capital gains and losses |  |  |  |  |  |  |  |  | (10) | (2) | 2
Other income |  |  |  |  |  |  |  |  | 3 | 36 | 55
Total revenues |  |  |  |  |  |  |  |  | 18 | 44 | 68
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 337 | 334 | 295
Pension and other postretirement remeasurement gains and losses |  |  |  |  |  |  |  |  | 454 | (219) | 264
Pension and other postretirement benefit expense |  |  |  |  |  |  |  |  | (116) | (224) | (159)
Other operating expenses |  |  |  |  |  |  |  |  | 50 | 50 | 28
Total costs and expenses |  |  |  |  |  |  |  |  | 725 | (59) | 428
(Loss) gain from operations before income tax benefit and equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (707) | 103 | (360)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (136) | 105 | (148)
Loss before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (571) | (2) | (212)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 2,731 | 3,556 | 2,020
Net income |  |  |  |  |  |  |  |  | 2,160 | 3,554 | 1,808
Preferred stock dividends |  |  |  |  |  |  |  |  | 148 | 116 | 116
Net income applicable to common shareholders |  |  |  |  |  |  |  |  | 2,012 | 3,438 | 1,692
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  |  |  |
Unrealized net capital gains and losses |  |  |  |  |  |  |  |  | (754) | 319 | 433
Unrealized foreign currency translation adjustments |  |  |  |  |  |  |  |  | (48) | 45 | 9
Unamortized pension and other postretirement prior service credit |  |  |  |  |  |  |  |  | (59) | (52) | (33)
Other comprehensive (loss) income, after-tax |  |  |  |  |  |  |  |  | (861) | 312 | 409
Comprehensive income |  |  |  |  |  |  |  |  | $ 1,299 | $ 3,866 | $ 2,217

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