Commitments, Guarantees and Contingent Liabilities - North Carolina (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
North Carolina Joint Underwriters Association
Loss Contingencies
Plan surplus receivable	$ 7
Funds surplus in member's equity	10
North Carolina Insurance Underwriting Association
Loss Contingencies
Funds surplus in member's equity	1,030
Maximum possible assessment	$ 1,000
Percentage of surcharge on property insurance policy statewide to be remitted to the plan	10.00%