Schedule II (STATEMENTS OF CASH FLOWS - Parent Company Only) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Total		$ 11,149	$ 9,785	$ 6,342
Dividends paid on Common Shares		(1,401)	(1,388)	(1,354)
Common Shares repurchased		(4,861)	(523)	(1,530)
Net cash flows (used for) from financing activities		(4,409)	(2,082)	(151)
Effect of foreign currency rate changes on cash and restricted cash		(106)	8	20
Cash and restricted cash – beginning of year		1,747	1,537
Cash and restricted cash – end of year		1,659	1,747	1,537
Payments for (Proceeds from) Other Investing Activities		337	470	657
Chubb limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Total	[1]	4,167	1,933	412
Payment Of Contributions To Subsidiary			(1,200)	(1,000)
Net cash flows used for investing activities		0	(1,202)	(1,000)
Dividends paid on Common Shares		(1,401)	(1,388)	(1,354)
Common Shares repurchased		(4,861)	(523)	(327)
Payments To From Affiliates		2,003	1,265	2,301
Net proceeds from (payments to) affiliated notional cash pooling programs	[2]	8	0	(35)
Net cash flows (used for) from financing activities		(4,251)	(646)	585
Effect of foreign currency rate changes on cash and restricted cash		1	(3)	4
Net increase (decrease) in cash and restricted cash		(83)	82	1
Cash and restricted cash – beginning of year		84	2	1
Cash and restricted cash – end of year		1	84	2
Cash dividend paid by Affiliates	[1]	3,700	2,000	200
Payments for (Proceeds from) Other Investing Activities		$ 0	$ (2)	$ 0

[1] Includes cash dividends received from subsidiaries of $3.7 billion, $2.0 billion, and $200 million in 2021, 2020, and 2019, respectively.

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