Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Net premiums written	$ 47,361	$ 41,720	$ 37,827
Increase in unearned premiums	(1,649)	(1,360)	(1,535)
Net premiums earned	45,712	40,360	36,292
Net investment income	4,937	3,742	3,456
Net realized gains (losses)	(607)	(1,085)	1,030
Market risk benefits gains (losses)	(307)	80	91
Total revenues	49,735	43,097	40,869
Expenses
Losses and loss expenses	24,100	22,572	21,030
Policy benefits (includes remeasurement gains of $19, $3, and nil)	3,628	2,314	1,740
Policy acquisition costs	8,259	7,339	6,758
Administrative expenses	4,007	3,395	3,135
Interest expense	672	570	492
Other (income) expense	(836)	89	(2,367)
Amortization of purchased intangibles	310	285	287
Cigna integration expenses	69	48	0
Total expenses	40,209	36,612	31,075
Income before income tax	9,526	6,485	9,794
Income tax expense	511	1,239	1,269
Net income	9,015	5,246	8,525
Net loss attributable to noncontrolling interests	(13)	0	0
Net income attributable to Chubb	9,028	5,246	8,525
Other comprehensive income (loss):
Unrealized appreciation (depreciation)	3,448	(10,578)	(2,938)
Current discount rate on future policy benefits	84	1,480	387
Instrument-specific credit risk on market risk benefits	2	33	27
Cumulative foreign currency translation adjustment	(13)	(911)	(505)
Other, including postretirement benefit liability adjustment	157	(100)	522
Other comprehensive income (loss), before income tax	3,678	(10,076)	(2,507)
Income tax (expense) benefit related to OCI items	(317)	965	366
Other comprehensive income (loss)	3,361	(9,111)	(2,141)
Comprehensive income (loss)	12,376	(3,865)	6,384
Comprehensive loss attributable to noncontrolling interests	(28)	0	0
Comprehensive income (loss) attributable to Chubb	$ 12,404	$ (3,865)	$ 6,384
Earnings per share
Basic earnings per share attributable to Chubb	$ 21.97	$ 12.50	$ 19.38
Diluted earnings per share attributable to Chubb	$ 21.80	$ 12.39	$ 19.24