Schedule II (STATEMENTS OF CASH FLOWS - 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]
Net Cash Provided by (Used in) Operating Activities, Total		$ 12,632	$ 11,258	$ 11,151
Other		(889)	(560)	(337)
Net Cash Provided by (Used in) Investing Activities		(7,648)	(5,654)	(6,659)
Dividends paid on Common Shares		(1,394)	(1,375)	(1,401)
Common Shares repurchased		(2,411)	(2,894)	(4,861)
Net cash flows (used for) from financing activities		(4,489)	(5,142)	(4,411)
Effect of foreign currency rate changes on cash and restricted cash		(1)	(146)	(106)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		494	316	(25)
Chubb limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Total	[1]	3,273	7,831	4,167
Capital contribution		0	(4,046)	0
Net Cash Provided by (Used in) Investing Activities		0	(4,046)	0
Dividends paid on Common Shares		(1,394)	(1,375)	(1,401)
Common Shares repurchased		(2,411)	(2,894)	(4,861)
Repayment of intercompany loans		231	279	2,003
Net proceeds from (payments to) affiliated notional cash pooling programs	[2]	342	245	8
Net cash flows (used for) from financing activities		(3,232)	(3,745)	(4,251)
Effect of foreign currency rate changes on cash and restricted cash		(4)	(1)	1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		37	39	(83)
Cash and restricted cash – beginning of year		40	1	84
Cash and restricted cash – end of year		77	40	1
Cash dividend paid by Affiliates	[1]	$ 3,300	$ 7,700	$ 3,700

[1] Includes cash dividends received from subsidiaries of $3.3 billion, $7.7 billion, and $3.7 billion in 2023, 2022, and 2021, respectively.

[2] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 i) for additional information.