Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Net earned premiums	$ 1,735	$ 1,811	$ 3,422	$ 3,617
Net investment income	500	550	1,058	1,076
Net realized investment gains (losses):
Other-than-temporary impairment losses	(31)	(5)	(43)	(7)
Portion of other-than-temporary impairments recognized in Other comprehensive income	0	0	0	0
Net other-than-temporary impairment losses recognized in earnings	(31)	(5)	(43)	(7)
Other net realized investment gains (loss)	31	(9)	53	39
Net realized investment gains (losses)	0	(14)	10	32
Other revenues	92	93	189	178
Total revenues	2,327	2,440	4,679	4,903
Claims, Benefits and Expenses
Insurance claims and policyholders' benefits	1,469	1,441	2,808	2,887
Amortization of deferred acquisition costs	314	335	617	664
Other operating expenses	341	254	699	600
Interest	39	46	78	90
Total claims, benefits and expenses	2,163	2,076	4,202	4,241
Income (loss) from continuing operations before income tax	164	364	477	662
Income tax (expense) benefit	(26)	(103)	(106)	(181)
Net income (loss) from continuing operations	138	261	371	481
(Loss) income from discontinued operations, net of income tax benefit (expense)	0	6	0	(201)
Net income (loss)	$ 138	$ 267	$ 371	$ 280
Basic Earnings (Loss) Per Share Attributable to CNA
Income from continuing operations	$ 0.51	$ 0.97	$ 1.37	$ 1.78
(Loss) income from discontinued operations	0.00	0.02	0.00	(0.74)
Basic earnings per share	0.51	0.99	1.37	1.04
Diluted Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations	0.51	0.97	1.37	1.78
(Loss) income from discontinued operations	0.00	0.01	0.00	(0.75)
Diluted earnings (loss) per share	0.51	0.98	1.37	1.03
Dividends per share	$ 0.25	$ 0.25	$ 2.50	$ 1.50
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	270.3	269.9	270.2	269.9
Diluted	270.7	270.6	270.7	270.5