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Insurance Liabilities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Jan. 20, 2017
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |  |  |  |
Contractual deductible recoverable amount | $ 12,300 |  | $ 12,300 |  | $ 12,100 |
Collateral held for deductible recoverable amounts | 8,800 |  | 8,800 |  | 8,600 |
Liability for unpaid losses and loss adjustment expenses, allowance for credit losses | 14 |  | 14 |  | 14 |
Unfavorable (favorable) prior year loss reserve development | 25 | $ (108) | (8) | $ (108) |  |
Net loss reserve discount | 1,166 |  | $ 1,166 |  | 1,175 |
Tabular discount rate (as a percent) |  |  | 45.00% |  |  |
Workers compensation tabular discount amount | 147 |  | $ 147 |  | 107 |
Workers compensation non tabular discount amount | 1,000 |  | 1,000 |  | $ 1,100 |
Net loss reserve discount charge | (12) | (26) | $ (29) | (102) |  |
New York |  |  |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |  |  |  |
Nontabular discount rate (as a percent) |  |  | 5.00% |  |  |
NICO |  |  |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |  |  |  |
Amortization of deferred gain on retroactive reinsurance | $ 93 | $ (6) | $ 110 | $ 21 |  |
U.S. Run-Off Long Tail Insurance Lines | NICO | Accident Years 2015 and Prior |  |  |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |  |  |  |
Risk Transferred - U.S. Commercial long-tail exposures for accident years 2015 and prior (as a percent) |  |  |  |  |  | 80.00%
Ceded to NICO percent of paid losses (as a percent) |  |  |  |  |  | 80.00%
Ceded to NICO net paid losses in excess |  |  |  |  |  | $ 25,000
Ceded to NICO net paid losses in excess, aggregate limit |  |  |  |  |  | 25,000
NICO's limit of liability under the contract |  |  |  |  |  | 20,000
Consideration paid, including interest |  |  |  |  |  | $ 10,200

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- Definition Represents the increase decrease in the liability for unpaid claims and claims adjustment expense related to the period for claims incurred in prior reporting periods and related claims settlement costs, excluding discount and amortization of deferred gain. + References No definition available. + Details
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- Definition Liability as of the balance sheet date for the estimated ultimate cost of settling claims and claim adjustment expense relating to insured events that have occurred on or before the balance sheet date for those liabilities owed to another party as a result of assuming another insurer's primary obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
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