Schedule II Schedule II (STATEMENTS OF OPERATIONS - Parent Company Only) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]
Equity in net income of subsidiaries and affiliates		$ 867	$ 1	$ 2,435
Total revenues		49,735	43,097	40,869
Administrative and other (income) expense		4,007	3,395	3,135
Business Combination, Integration Related Costs		69	48	0
Income tax expense		511	1,239	1,269
Total expenses		40,209	36,612	31,075
Net income attributable to Chubb		9,028	5,246	8,525
Comprehensive income (loss)		12,376	(3,865)	6,384
Chubb limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Investment income, including intercompany interest income	[1]	(21)	83	96
Equity in net income of subsidiaries and affiliates		9,065	5,256	8,500
Total revenues		9,044	5,339	8,596
Administrative and other (income) expense		72	65	56
Business Combination, Integration Related Costs		0	10	0
Income tax expense		(56)	18	15
Total expenses		16	93	71
Net income attributable to Chubb		9,028	5,246	8,525
Comprehensive income (loss)		$ 12,404	$ (3,865)	$ 6,384

[1] (1) Includes net investment income, interest income, and net realized gains (losses).