Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Net earned premiums	$ 1,595	$ 1,608	$ 3,210	$ 3,223
Net investment income	517	521	1,137	1,111
Net realized investment gains (losses), net of participating policyholders’ interests:
Other-than-temporary impairment losses	(41)	(58)	(61)	(148)
Portion of other-than-temporary impairments recognized in Other comprehensive income (loss)	(21)	1	(42)	31
Net other-than-temporary impairment losses recognized in earnings	(62)	(57)	(103)	(117)
Other net realized investment gains (losses)	77	86	131	180
Net realized investment gains (losses), net of participating policyholders’ interests	15	29	28	63
Other revenues	71	75	138	151
Total revenues	2,198	2,233	4,513	4,548
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	1,367	1,147	2,731	2,455
Amortization of deferred acquisition costs	350	345	695	687
Other operating expenses	259	258	484	530
Interest	43	37	89	73
Total claims, benefits and expenses	2,019	1,787	3,999	3,745
Income (loss) from continuing operations before income tax	179	446	514	803
Income tax (expense) benefit	(47)	(145)	(149)	(247)
Income (loss) from continuing operations, net of tax	132	301	365	556
Income (loss) from discontinued operations, net of income tax (expense) benefit of $0, $0, $0 and $0	0	1	(1)	1
Net Income (Loss)	132	302	364	557
Net (income) loss attributable to noncontrolling interests	(6)	(19)	(15)	(29)
Net income (loss) attributable to CNA	126	283	349	528
Income (Loss) Available to Common Stockholders
Income (loss) from continuing operations attributable to CNA	126	282	350	527
Less: 2008 Senior Preferred dividend	0	(25)	0	(50)
Income (loss) from continuing operations attributable to CNA common stockholders	126	257	350	477
Income (loss) from discontinued operations attributable to CNA common stockholders	0	1	(1)	1
Income (loss) attributable to CNA common stockholders	$ 126	$ 258	$ 349	$ 478
Basic and Diluted Earnings Per Share Attributable to CNA Common Stockholders
Income (loss) from continuing operations attributable to CNA common stockholders	$ 0.47	$ 0.96	$ 1.3	$ 1.77
Income (loss) from discontinued operations attributable to CNA common stockholders	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Basic and diluted earnings (loss) per share attributable to CNA common stockholders	$ 0.47	$ 0.96	$ 1.3	$ 1.78
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	269.3	269.1	269.3	269.1
Diluted	269.6	269.3	269.6	269.3