Commitments, Guarantees and Contingent Liabilities - North Carolina and New Jersey Property-Liability (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
New Jersey Unsatisfied Claim and Judgment Fund
Loss Contingencies
Insurance fund balance		$ 74
North Carolina Joint Underwriters Association
Loss Contingencies
Plan surplus receivable	$ 14
Funds surplus in member's equity	87
North Carolina Insurance Underwriting Association
Loss Contingencies
Funds surplus in member's equity	1,600
Maximum possible assessment	$ 1,000
Percentage of surcharge on property insurance policy statewide to be remitted to the plan	10.00%