Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Net premiums written	$ 51,468	$ 47,361	$ 41,720
Increase in unearned premiums	(1,622)	(1,649)	(1,360)
Net premiums earned	49,846	45,712	40,360
Net investment income	5,930	4,937	3,742
Net realized gains (losses)	117	(607)	(1,085)
Market risk benefits gains (losses)	(140)	(307)	80
Total revenues	55,753	49,735	43,097
Expenses
Losses and loss expenses	26,022	24,100	22,572
Policy benefits (includes remeasurement gains (losses) of $(2), $19, and $3)	4,714	3,628	2,314
Policy acquisition costs	9,102	8,259	7,339
Administrative expenses	4,380	4,007	3,395
Interest expense	741	672	570
Other (income) expense	(1,023)	(836)	89
Amortization of purchased intangibles	323	310	285
Integration expenses	39	69	48
Total expenses	44,298	40,209	36,612
Income before income tax	11,455	9,526	6,485
Income tax expense	1,815	511	1,239
Net income	9,640	9,015	5,246
Net income (loss) attributable to noncontrolling interests	368	(13)	0
Net income attributable to Chubb	9,272	9,028	5,246
Other comprehensive income (loss):
Unrealized appreciation (depreciation)	(251)	3,448	(10,578)
Current discount rate on future policy benefits	(701)	84	1,480
Instrument-specific credit risk on market risk benefits	7	2	33
Cumulative foreign currency translation adjustment	(1,177)	(13)	(911)
Other, including postretirement benefit liability adjustment	257	157	(100)
Other comprehensive income (loss), before income tax	(1,865)	3,678	(10,076)
Income tax (expense) benefit related to OCI items	(117)	(317)	965
Other comprehensive income (loss)	(1,982)	3,361	(9,111)
Comprehensive income (loss)	7,658	12,376	(3,865)
Comprehensive income (loss) attributable to noncontrolling interests	221	(28)	0
Comprehensive income (loss) attributable to Chubb	$ 7,437	$ 12,404	$ (3,865)
Earnings per share
Basic earnings per share attributable to Chubb	$ 22.94	$ 21.97	$ 12.50
Diluted earnings per share attributable to Chubb	$ 22.70	$ 21.80	$ 12.39