Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock, Common	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent	Noncontrolling Interest
Total shareholders' equity		$ 241	$ (4,400)	$ 15,665	$ 54,810	$ (6,809)		$ 4,184
Treasury Stock, Retired, Cost Method, Amount		(6)	(2,527)		(2,521)
Common Shares repurchased			(1,299)
Net shares issued under employee share-based compensation plans			335
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				(139)
Exercise of stock options				(22)
Share-based compensation expense				258
Adjustments to Additional Paid in Capital, Other				(31)
Funding of dividends declared to Retained earnings				(1,088)
Net income attributable to Chubb	$ 6,697				6,697
Funding of dividends declared from Additional paid-in capital					1,088
Dividends declared on Common Shares					(1,088)
Other Comprehensive Income (Loss), Net of Tax	1,489					1,539
Net increase (decrease) due to consolidation, deconsolidation, and other transactions								(68)
Net income attributable to noncontrolling interests	303							303
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								(50)
Other								(6)
Withdrawal from Contract Holders Funds	(534)
Net Consolidations of consolidated investment products	(13)
Total shareholders' equity		235	(2,481)	14,926	56,662	(8,304)		3,537
Treasury Stock, Retired, Cost Method, Amount		0	0		0
Common Shares repurchased			(413)
Net shares issued under employee share-based compensation plans			(57)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				3
Exercise of stock options				(3)
Share-based compensation expense				86
Adjustments to Additional Paid in Capital, Other				0
Funding of dividends declared to Retained earnings				(369)
Net income attributable to Chubb	2,324				2,324
Funding of dividends declared from Additional paid-in capital					369
Dividends declared on Common Shares					(369)
Other Comprehensive Income (Loss), Net of Tax	3,055					3,034
Net increase (decrease) due to consolidation, deconsolidation, and other transactions								639
Net income attributable to noncontrolling interests	166							166
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								21
Other								0
Total shareholders' equity	70,120	235	(2,837)	14,643	58,986	(5,270)	$ 65,757	4,363
Total shareholders' equity	68,394	235	(3,524)	14,393	61,561	(8,644)		4,373
Treasury Stock, Retired, Cost Method, Amount		(4)	(1,942)		(1,939)
Common Shares repurchased			(2,293)
Net shares issued under employee share-based compensation plans			193
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				(112)
Exercise of stock options				3
Share-based compensation expense				278
Adjustments to Additional Paid in Capital, Other				53
Funding of dividends declared to Retained earnings				(1,139)
Net income attributable to Chubb	7,100				7,100
Funding of dividends declared from Additional paid-in capital					1,139
Dividends declared on Common Shares					(1,139)
Other Comprehensive Income (Loss), Net of Tax	3,844					3,752
Net increase (decrease) due to consolidation, deconsolidation, and other transactions								1,142
Net income attributable to noncontrolling interests	349							349
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								92
Other								0
Withdrawal from Contract Holders Funds	(465)
Net Consolidations of consolidated investment products	(10)
Total shareholders' equity		231	(2,462)	13,763	63,921	(6,058)		5,052
Treasury Stock, Retired, Cost Method, Amount		0	0		0
Common Shares repurchased			(1,232)
Net shares issued under employee share-based compensation plans			(12)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				8
Exercise of stock options				1
Share-based compensation expense				89
Adjustments to Additional Paid in Capital, Other				0
Funding of dividends declared to Retained earnings				(385)
Net income attributable to Chubb	2,801				2,801
Funding of dividends declared from Additional paid-in capital					385
Dividends declared on Common Shares					(385)
Other Comprehensive Income (Loss), Net of Tax	1,246					1,166
Net increase (decrease) due to consolidation, deconsolidation, and other transactions								518
Net income attributable to noncontrolling interests	306							306
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								80
Other								0
Total shareholders' equity	$ 77,811	$ 231	$ (3,682)	$ 13,476	$ 66,722	$ (4,892)	$ 71,855	$ 5,956