Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Net earned premiums	$ 1,732	$ 1,645	$ 4,942	$ 4,868
Net investment income	394	581	1,531	1,692
Net realized investment gains (losses), net of participating policyholders’ interests:
Other-than-temporary impairment losses	(75)	(41)	(136)	(189)
Portion of other-than-temporary impairments recognized in Other comprehensive income (loss)	(2)	(3)	(44)	28
Net other-than-temporary impairment losses recognized in earnings	(77)	(44)	(180)	(161)
Other net realized investment gains (losses)	50	106	181	286
Net realized investment gains (losses), net of participating policyholders’ interests	(27)	62	1	125
Other revenues	76	75	214	226
Total revenues	2,175	2,363	6,688	6,911
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	1,400	1,344	4,131	3,799
Amortization of deferred acquisition costs	356	351	1,051	1,038
Other operating expenses	252	795	736	1,325
Interest	43	40	132	113
Total claims, benefits and expenses	2,051	2,530	6,050	6,275
Income (loss) from continuing operations before income tax	124	(167)	638	636
Income tax (expense) benefit	(49)	64	(198)	(183)
Income (loss) from continuing operations	75	(103)	440	453
Income (loss) from discontinued operations, net of income tax (expense) benefit of -, $0, $0 and $0		(22)	(1)	(21)
Net income (loss)	75	(125)	439	432
Net (income) loss attributable to noncontrolling interests		(15)	(15)	(44)
Net income (loss) attributable to CNA	75	(140)	424	388
Income (Loss) Available to CNA Common Stockholders
Income (loss) from continuing operations attributable to CNA	75	(118)	425	409
Dividends on 2008 Senior Preferred		(18)		(68)
Income (loss) from continuing operations attributable to CNA common stockholders	75	(136)	425	341
Income (loss) from discontinued operations attributable to CNA common stockholders		(22)	(1)	(21)
Income (loss) attributable to CNA common stockholders	$ 75	$ (158)	$ 424	$ 320
Basic and Diluted Earnings (Loss) Per Share Attributable to CNA Common Stockholders
Income (loss) from continuing operations attributable to CNA common stockholders	$ 0.28	$ (0.51)	$ 1.58	$ 1.27
Income (loss) from discontinued operations attributable to CNA common stockholders		$ (0.08)		$ (0.08)
Basic and diluted earnings (loss) per share attributable to CNA common stockholders	$ 0.28	$ (0.59)	$ 1.58	$ 1.19
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	269.3	269.2	269.3	269.1
Diluted	269.6	269.2	269.6	269.4