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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, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Revenues |  |  |  |  |  |  |  |  |  |  |
Investment income, less investment expense |  |  |  |  |  |  |  |  | $ 3,449 | $ 3,092 | $ 2,478
Net gains (losses) on investments and derivatives |  |  |  |  |  |  |  |  | (168) | (225) | (300)
Total revenues | $ 17,345 | $ 17,255 | $ 16,633 | $ 16,452 | $ 16,506 | $ 16,627 | $ 15,714 | $ 15,259 | 67,685 | 64,106 | 57,094
Expenses |  |  |  |  |  |  |  |  |  |  |
Pension and other postretirement remeasurement (gains) losses |  |  |  |  |  |  |  |  | (35) | (37) | 9
Other operating expenses |  |  |  |  |  |  |  |  | 8,977 | 8,626 | 7,137
Total costs and expenses |  |  |  |  |  |  |  |  | 56,132 | 58,345 | 57,442
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,890 | 1,162 | (135)
Net income (loss) attributable to Allstate |  |  |  |  |  |  |  |  | 10,282 | 4,667 | (188)
Preferred stock dividends |  |  |  |  |  |  |  |  | 117 | 117 | 128
Net income (loss) applicable to common shareholders, basic | 3,803 | 3,717 | 2,079 | 566 | 1,899 | 1,161 | 301 | 1,189 | 10,165 | 4,550 | (316)
Net income (loss) applicable to common shareholders, diluted | $ 3,803 | $ 3,717 | $ 2,079 | $ 566 | $ 1,899 | $ 1,161 | $ 301 | $ 1,189 | 10,165 | 4,550 | (316)
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  |  |  |
Unrealized foreign currency translation adjustments |  |  |  |  |  |  |  |  | 90 | (47) | 67
Unamortized pension and other postretirement prior service credit |  |  |  |  |  |  |  |  | 0 | (2) | (16)
Discount rate for reserve for future policy benefits |  |  |  |  |  |  |  |  | (14) | 27 | (10)
Less: change in unrealized net capital gains and losses related to noncontrolling interest |  |  |  |  |  |  |  |  | (1,068) | 167 | (1,651)
Comprehensive income attributable to Allstate |  |  |  |  |  |  |  |  | 11,423 | 4,468 | 1,494
Allstate Corporation |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Investment income, less investment expense |  |  |  |  |  |  |  |  | 102 | 49 | 45
Net gains (losses) on investments and derivatives |  |  |  |  |  |  |  |  | 7 | (9) | (28)
Total revenues |  |  |  |  |  |  |  |  | 109 | 40 | 17
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 405 | 411 | 396
Pension and other postretirement remeasurement (gains) losses |  |  |  |  |  |  |  |  | (25) | (21) | 12
Pension and other postretirement (benefit) expense |  |  |  |  |  |  |  |  | (11) | (36) | 55
Other operating expenses |  |  |  |  |  |  |  |  | 75 | 70 | 142
Total costs and expenses |  |  |  |  |  |  |  |  | 444 | 424 | 605
Gain on disposition of subsidiaries |  |  |  |  |  |  |  |  | 716 | 0 | 0
Gain (loss) from operations before income tax benefit and equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 381 | (384) | (588)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 167 | (97) | (143)
Gain (loss) before equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 214 | (287) | (445)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 10,068 | 4,954 | 257
Net income (loss) attributable to Allstate |  |  |  |  |  |  |  |  | 10,282 | 4,667 | (188)
Preferred stock dividends |  |  |  |  |  |  |  |  | 117 | 117 | 128
Net income (loss) applicable to common shareholders, basic |  |  |  |  |  |  |  |  | 10,165 | 4,550 | (316)
Net income (loss) applicable to common shareholders, diluted |  |  |  |  |  |  |  |  | 10,165 | 4,550 | (316)
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  |  |  |
Unrealized net capital gains and losses |  |  |  |  |  |  |  |  | 1,068 | (167) | 1,651
Unrealized foreign currency translation adjustments |  |  |  |  |  |  |  |  | 90 | (47) | 67
Unamortized pension and other postretirement prior service credit |  |  |  |  |  |  |  |  | 0 | (2) | (16)
Discount rate for reserve for future policy benefits |  |  |  |  |  |  |  |  | (14) | 27 | (10)
Other comprehensive income (loss), after-tax |  |  |  |  |  |  |  |  | 1,144 | (189) | 1,692
Less: change in unrealized net capital gains and losses related to noncontrolling interest |  |  |  |  |  |  |  |  | 3 | 10 | 10
Comprehensive income attributable to Allstate |  |  |  |  |  |  |  |  | $ 11,423 | $ 4,468 | $ 1,494

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