Schedule II (STATEMENTS OF CASH FLOWS - Parent Company Only) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Total		$ 11,243	$ 11,149	$ 9,785
Other		(560)	(337)	(470)
Net Cash Provided by (Used in) Investing Activities		(5,654)	(6,659)	(7,521)
Dividends paid on Common Shares		(1,375)	(1,401)	(1,388)
Common Shares repurchased		(2,894)	(4,861)	(523)
Net cash flows (used for) from financing activities		(5,127)	(4,409)	(2,082)
Effect of foreign currency rate changes on cash and restricted cash		(146)	(106)	8
Net increase (decrease) in cash and restricted cash		316	(25)	190
Cash and restricted cash – beginning of year		1,659	1,747
Cash and restricted cash – end of year		2,012	1,659	1,747
Chubb limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Total	[1]	7,831	4,167	1,933
Capital contribution		(4,046)	0	(1,200)
Other		0	0	(2)
Net Cash Provided by (Used in) Investing Activities		(4,046)	0	(1,202)
Dividends paid on Common Shares		(1,375)	(1,401)	(1,388)
Common Shares repurchased		(2,894)	(4,861)	(523)
Repayment of intercompany loans		279	2,003	1,265
Net proceeds from (payments to) affiliated notional cash pooling programs	[2]	245	8	0
Net cash flows (used for) from financing activities		(3,745)	(4,251)	(646)
Effect of foreign currency rate changes on cash and restricted cash		(1)	1	(3)
Net increase (decrease) in cash and restricted cash		39	(83)	82
Cash and restricted cash – beginning of year		1	84	2
Cash and restricted cash – end of year		40	1	84
Cash dividend paid by Affiliates	[1]	$ 7,700	$ 3,700	$ 2,000

[1] Includes cash dividends received from subsidiaries of $7.7 billion, $3.7 billion, and $2.0 billion in 2022, 2021, and 2020, respectively.

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