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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Schedule of Unearned Premiums | The portion of premiums written applicable to the unexpired terms of the policies is recorded as unearned premiums.
Unearned premiums
|  | December 31,
($ in millions) |  | 2025 |  | 2024
Allstate Protection |  | $ | 23,464 |  |  | $ | 21,508 |
Protection Services |  | 5,605 |  |  | 5,385 |
Allstate Health and Benefits |  | — |  |  | 2 |
All other |  | 11 |  |  | 14 |
Total |  | $ | 29,080 |  |  | $ | 26,909 |
Schedule of Rollforward of Credit Loss Allowance for Premium Installment Receivables and Allowance for Credit Loss |
Rollforward of credit loss allowance for premium installment receivables
|  | For the years ended December 31,
($ in millions) |  | 2025 |  | 2024
Beginning balance |  | $ | (187) |  |  | $ | (138) |
Increase in the provision for credit losses |  | (487) |  |  | (414) |
Write-off of uncollectible premium installment receivable amounts |  | 485 |  |  | 365 |
Ending balance |  | $ | (189) |  |  | $ | (187) |
Allowance for credit losses
|  | As of December 31,
($ in millions) |  | 2025 |  | 2024
Fixed income securities |  | $ | 10 |  |  | $ | 17 |
Mortgage loans |  | 10 |  |  | 12 |
Bank loans |  | 17 |  |  | 10 |
Investments |  | 37 |  |  | 39 |
Premium installment receivables |  | 189 |  |  | 187 |
Reinsurance recoverables |  | 54 |  |  | 63 |
Other assets |  | 15 |  |  | 14 |
Assets |  | 295 |  |  | 303 |
Commitments to fund line of credit, commercial mortgage loans and bank loans |  | 15 |  |  | — |
Liabilities |  | 15 |  |  | — |
Total |  | $ | 310 |  |  | $ | 303 |
Rollforward of credit loss allowance for fixed income securities
|  | For the years ended December 31,
($ in millions) |  | 2025 |  | 2024 |  | 2023 |  |  |  |
Beginning balance |  | $ | (17) |  |  | $ | (36) |  |  | $ | (13) |  |  |  |  |
Credit losses on securities for which credit losses not previously reported |  | (3) |  |  | (8) |  |  | (11) |  |  |  |  |
Net (increases) decreases related to credit losses previously reported |  | (2) |  |  | 2 |  |  | (11) |  |  |  |  |
Decrease (increase) related to sales and other |  | — |  |  | 3 |  |  | (1) |  |  |  |  |
Write-offs |  | 12 |  |  | 22 |  |  | — |  |  |  |  |
Ending balance |  | $ | (10) |  |  | $ | (17) |  |  | $ | (36) |  |  |  |  |
Components of credit loss allowance as of December 31 |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | (8) |  |  | (16) |  |  | (35) |  |  |  |  |
ABS |  | (2) |  |  | (1) |  |  | (1) |  |  |  |  |
Total |  | $ | (10) |  |  | $ | (17) |  |  | $ | (36) |  |  |  |  |
Rollforward of credit loss allowance for mortgage loans
|  | For the years ended December 31,
($ in millions) |  | 2025 |  | 2024 |  | 2023
Beginning balance |  | $ | (12) |  |  | $ | (11) |  |  | $ | (7) |
Net increases related to credit losses |  | (2) |  |  | (1) |  |  | (4) |
Write-offs |  | 4 |  |  | — |  |  | — |
Ending balance |  | $ | (10) |  |  | $ | (12) |  |  | $ | (11) |
Components of credit loss allowance as of December 31 |  |  |  |  |  |
Commercial |  | $ | (9) |  |  | $ | (12) |  |  | $ | (11) |
Residential |  | (1) |  |  | — |  |  | — |
Total |  | $ | (10) |  |  | $ | (12) |  |  | $ | (11) |
Rollforward of credit loss allowance for bank loans
|  | For the years ended December 31,
($ in millions) |  | 2025 |  | 2024 |  | 2023
Beginning balance |  | $ | (10) |  |  | $ | (22) |  |  | $ | (57) |
Net (increases) decreases related to credit losses |  | (12) |  |  | 6 |  |  | (18) |
Reduction related to sales |  | — |  |  | — |  |  | 50 |
Write-offs |  | 5 |  |  | 6 |  |  | 3 |
Ending balance |  | $ | (17) |  |  | $ | (10) |  |  | $ | (22) |
Schedule of Goodwill by Reporting Unit | he Company tests goodwill at its reporting units, Allstate Protection, Protection Services and Individual Health.
Goodwill by reporting unit
|  | December 31,
($ in millions) |  | 2025 |  | 2024
Allstate Protection |  | $ | 1,563 |  |  | $ | 1,563 |
Protection Services |  | 1,511 |  |  | 1,511 |
Allstate Health and Benefits and Individual Health (1) |  | 44 |  |  | 171 |
Total |  | $ | 3,118 |  |  | $ | 3,245 |
(1)Employer voluntary benefits and group health businesses comprising Allstate Health and Benefits were sold in 2025.
Schedule of Deferred Policy Acquisition Costs Activity |
Rollforward of deferred policy acquisition costs
|  | For the years ended December 31,
($ in millions) |  | 2025 |  | 2024 |  | 2023
Beginning balance |  | $ | 5,773 |  |  | $ | 5,940 |  |  | $ | 5,442 |
Acquisition costs deferred |  | 8,784 |  |  | 8,393 |  |  | 7,776 |
Amortization charged to income |  | (8,384) |  |  | (8,022) |  |  | (7,246) |
Experience adjustment |  | (5) |  |  | (17) |  |  | (32) |
Reclassified to assets held for sale (1) |  | (5) |  |  | (521) |  |  | — |
Ending balance |  | $ | 6,163 |  |  | $ | 5,773 |  |  | $ | 5,940 |
Allstate Protection |  | $ | 2,803 |  |  | $ | 2,548 |  |  | $ | 2,378 |
Protection Services |  | 3,274 |  |  | 3,161 |  |  | 3,022 |
Allstate Health and Benefits |  | — |  |  | 1 |  |  | 497 |
All other |  | 86 |  |  | 63 |  |  | 43 |
Total |  | $ | 6,163 |  |  | $ | 5,773 |  |  | $ | 5,940 |
(1)Sold on April 1, 2025 as part of the employer voluntary benefits disposition.
Schedule of Intangible Assets by Type | Intangible assets are carried at cost less accumulated amortization.
Intangible assets by type
|  | December 31,
($ in millions) |  | 2025 |  | 2024
Distribution and customer relationships |  | $ | 214 |  |  | $ | 367 |
Trade names and licenses (1) |  | 126 |  |  | 145 |
Technology and other |  | 218 |  |  | 242 |
Total |  | $ | 558 |  |  | $ | 754 |
(1)Includes finite-lived trade names with carrying values of $7 million as of December 31, 2024 that were fully amortized at the end of 2025.
Schedule of Amortization Expense of Intangible Assets |
Amortization expense of intangible assets for the next five years and thereafter
($ in millions) |  |  |  |
2026 |  |  |  | $ | 172 |
2027 |  |  |  | 125 |
2028 |  |  |  | 83 |
2029 |  |  |  | 38 |
2030 |  |  |  | 14 |
Total amortization |  |  |  | $ | 432 |

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