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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Anticipated amounts due from insureds related to losses under deductible policies | $ 1,300 | $ 1,200 |
Structured settlement annuities, interest rate, low end | 6.60% | 6.40% |
Discounted reserves for unfunded structured settlements | $ 444 | $ 465 |
Discounted reserves for unfunded structure settlements, discount amount | 535 | 559 |
Amount of interest recognized on the discounted reserves of unfunded structured settlements | $ 33 | $ 34 | $ 36
Interest rates at which workers' compensation lifetime claim reserves are discounted at | 3.50% | 3.50% |
Workers' compensation liability | $ 179 | $ 196 |
Amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves | $ 6 | 9 | $ 9
Future policy benefit reserves, cash flows projected to occur beyond tenor with market-observable rates available, grading period | 10 years |  |
Liability balance for guaranty fund | $ 86 | $ 84 |
Percentage of billed receivables compared to total reinsurance receivable | 6.00% |  |
Policyholder dividends, rate on policy earnings | 2.00% | 2.00% | 2.00%
Foreign currency transaction gain (loss), before tax | $ (8) | $ 9 | $ (22)
Operating lease, right-of-use asset, statement of financial position [Extensible List] | Other assets | Other assets |
Operating lease, liability, statement of financial position [Extensible List] | Other liabilities | Other liabilities |
Weighted average number diluted shares outstanding adjustment (in shares) | 1 | 1 | 1
Interest paid, net | $ 122 | $ 124 | $ 109
Income taxes paid | 281 | 282 | $ 277
Workers' Compensation Insurance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Short-duration contracts, discounted liabilities, amount | $ 80 | $ 88 |
Furniture and Fixtures |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, plant and equipment, useful life | 7 years |  |
Office Equipment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |
Computer Software, Intangible Asset |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Warranty coverage term | 1 month |  |
Requisite service period for stock- based compensation expense | 3 years |  |
Minimum | Computer Software, Intangible Asset |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Warranty coverage term | 10 years |  |
Maximum | Computer Software, Intangible Asset |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |
CNAF Consolidated | Loews |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Noncontrolling interest, ownership percentage by parent | 92.00% |  |

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