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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues |  |  |  |  |  |  |  |  |  |  |
Investment income, less investment expense |  |  |  |  |  |  |  |  | $ 2,853 | $ 3,159 | $ 3,240
Realized capital gains (losses) | $ 4 |  |  |  |  |  |  |  | 1,356 | 1,885 | (877)
Total revenues | 12,018 | $ 11,500 | $ 11,197 | $ 10,076 | $ 11,472 | $ 11,069 | $ 11,144 | $ 10,990 | 44,791 | 44,675 | 39,815
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 318 | 327 | 332
Pension and other postretirement remeasurement (gains) losses |  |  |  |  |  |  |  |  | (51) | 114 | 468
Other operating expenses |  |  |  |  |  |  |  |  | 5,732 | 5,690 | 5,594
Total costs and expenses |  |  |  |  |  |  |  |  | 37,836 | 38,592 | 37,193
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 1,383 | 1,242 | 468
Net income |  |  |  |  |  |  |  |  | 5,576 | 4,847 | 2,160
Preferred stock dividends |  |  |  |  |  |  |  |  | 115 | 169 | 148
Net income (loss) applicable to common shareholders | $ 2,598 | $ 1,126 | $ 1,224 | $ 513 | $ 1,707 | $ 889 | $ 821 | $ 1,261 | 5,461 | 4,678 | 2,012
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  |  |  |
Unrealized net capital gains and losses |  |  |  |  |  |  |  |  | 1,293 | 1,889 | (754)
Unrealized foreign currency translation adjustments |  |  |  |  |  |  |  |  | 52 | (10) | (48)
Unamortized pension and other postretirement prior service credit |  |  |  |  |  |  |  |  | 9 | (47) | (59)
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  | 1,354 | 1,832 | (861)
Comprehensive income |  |  |  |  |  |  |  |  | 6,930 | 6,679 | 1,299
Allstate Corporation |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Investment income, less investment expense |  |  |  |  |  |  |  |  | 12 | 35 | 25
Realized capital gains (losses) |  |  |  |  |  |  |  |  | 33 | 9 | (10)
Other income |  |  |  |  |  |  |  |  | 0 | 41 | 3
Total revenues |  |  |  |  |  |  |  |  | 45 | 85 | 18
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 328 | 355 | 337
Pension and other postretirement remeasurement (gains) losses |  |  |  |  |  |  |  |  | (73) | 103 | 454
Pension and other postretirement benefit |  |  |  |  |  |  |  |  | (168) | (122) | (116)
Other operating expenses |  |  |  |  |  |  |  |  | 73 | 49 | 50
Total costs and expenses |  |  |  |  |  |  |  |  | 160 | 385 | 725
Loss from operations before income tax benefit and equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (115) | (300) | (707)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (26) | (75) | (136)
Loss before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (89) | (225) | (571)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 5,665 | 5,072 | 2,731
Net income |  |  |  |  |  |  |  |  | 5,576 | 4,847 | 2,160
Preferred stock dividends |  |  |  |  |  |  |  |  | 115 | 169 | 148
Net income (loss) applicable to common shareholders |  |  |  |  |  |  |  |  | 5,461 | 4,678 | 2,012
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  |  |  |
Unrealized net capital gains and losses |  |  |  |  |  |  |  |  | 1,293 | 1,889 | (754)
Unrealized foreign currency translation adjustments |  |  |  |  |  |  |  |  | 52 | (10) | (48)
Unamortized pension and other postretirement prior service credit |  |  |  |  |  |  |  |  | 9 | (47) | (59)
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  | 1,354 | 1,832 | (861)
Comprehensive income |  |  |  |  |  |  |  |  | $ 6,930 | $ 6,679 | $ 1,299

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