Market risk benefits (Tables)

12 Months Ended

Dec. 31, 2023

Market Risk Benefit [Abstract]

Market Risk Benefit, Activity

The following table presents a roll-forward of MRB:

	For the Years Ended December 31
(in millions of U.S. dollars)	2023		2022		2021
Balance – beginning of period	$	800	$	812	$	1,163
Balance, beginning of period, before effect of changes in the instrument-specific credit risk	776		755		1,079
Interest rate changes	26		(568)		(157)
Effect of changes in equity markets	(195)		513		(223)
Effect of changes in volatilities	20		27		(65)
Actual policyholder behavior different from expected behavior	18		(13)		42
Effect of changes in future expected policyholder behavior	89		40		24
Effect of timing and all other	15		22		55
Balance, end of period, before effect of changes in the instrument-specific credit risk	$	749	$	776	$	755
Effect of changes in the instrument-specific credit risk	22		24		57
Balance – end of period	$	771	$	800	$	812
Weighted-average age of policyholders (years)	74		73		72
Net amount at risk (1)	$	1,872	$	2,508	$	1,759

(1)The net amount at risk is defined as the present value of future claim payments assuming policy account values and guaranteed values are fixed at the valuation date, and reinsurance coverage ends at the earlier of the maturity of the underlying variable annuity policy or the reinsurance treaty. No withdrawals, lapses, and mortality improvements are assumed in the projection. GLB-related risks contain conservative mortality and annuitization assumptions.

Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations

For MRB, Chubb estimates fair value using an internal valuation model which includes a number of factors including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality. All reinsurance treaties contain claim limits, which are also factored into the valuation model.

	Valuation Technique	Significant Unobservable Inputs	December 31, 2023			December 31, 2022			December 31, 2021
			Ranges	Weighted Average(1)		Ranges	Weighted Average(1)		Ranges	Weighted Average(1)
MRB (1)	Actuarial model	Lapse rate	0.5% – 30.0%	4.0	%	0.5% – 30.4%	3.5	%	0.5% – 31.5%	4.8	%
		Annuitization rate	0% – 100%	4.5	%	0% – 100%	4.4	%	0% – 100%	3.6	%

(1)The weighted-average lapse and annuitization rates are determined by weighting each treaty's rates by the MRB contract's fair value.