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		$ 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			(385)
Net shares issued under employee share-based compensation plans			(168)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				(146)
Exercise of stock options				1
Share-based compensation expense				94
Adjustments to Additional Paid in Capital, Other				0
Funding of dividends declared to Retained earnings				(366)
Net income attributable to Chubb	$ 1,331				1,331
Funding of dividends declared from Additional paid-in capital					366
Dividends declared on Common Shares					(366)
Other Comprehensive Income (Loss), Net of Tax	1,004					1,009
Net increase (decrease) due to consolidation, deconsolidation, and other transactions								649
Net income attributable to noncontrolling interests	12							12
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								(5)
Total shareholders' equity	70,755	231	(1,799)	13,976	60,953	(7,635)	$ 65,726	5,029
Total shareholders' equity	79,779	231	(4,699)	13,250	69,950	(4,975)		6,022
Treasury Stock, Retired, Cost Method, Amount		(7)	(3,455)		(3,449)
Common Shares repurchased			(1,143)
Net shares issued under employee share-based compensation plans			(85)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				(66)
Exercise of stock options				5
Share-based compensation expense				100
Adjustments to Additional Paid in Capital, Other				47
Funding of dividends declared to Retained earnings				(380)
Net income attributable to Chubb	2,320				2,320
Funding of dividends declared from Additional paid-in capital					380
Dividends declared on Common Shares					(380)
Other Comprehensive Income (Loss), Net of Tax	(765)					(936)
Net increase (decrease) due to consolidation, deconsolidation, and other transactions								(96)
Net income attributable to noncontrolling interests	27							27
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								171
Total shareholders' equity	$ 79,912	$ 224	$ (2,302)	$ 12,956	$ 68,821	$ (5,911)	$ 73,788	$ 6,124