Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues
Net earned premiums	$ 7,212		$ 7,271		$ 6,881
Net investment income	2,067		2,282		2,110
Net realized investment gains (losses):
Other-than-temporary impairment losses	(77)		(74)		(127)
Portion of other-than-temporary impairments recognized in Other comprehensive income			(2)		(23)
Net other-than-temporary impairment losses recognized in earnings	(77)		(76)		(150)
Other net realized investment gains (loss)	134		96		204
Net realized investment gains (losses)	57		20		54
Other revenues	356		359		319
Total revenues	9,692		9,932		9,364
Claims, Benefits and Expenses
Insurance claims and policyholders' benefits	5,591		5,806		5,729
Amortization of deferred acquisition costs	1,317		1,362		1,274
Other operating expenses	1,394		1,322		1,332
Interest	183		166		170
Total claims, benefits and expenses	8,485		8,656		8,505
Income (loss) from continuing operations before income tax	1,207		1,276		859
Income tax expense (benefit)	(319)		(361)		(239)
Net income (loss) from continuing operations	888		915		620
(Loss) income from discontinued operations, net of income tax benefit (expense)	(197)		22		8
Net income (loss)	$ 691	[1]	$ 937		$ 628
Basic Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations	$ 3.29		$ 3.39		$ 2.30
(Loss) income from discontinued operations	$ (0.73)		$ 0.09		$ 0.03
Basic earnings (loss) per share	$ 2.56		$ 3.48		$ 2.33
Diluted Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations	$ 3.28		$ 3.39		$ 2.30
(Loss) income from discontinued operations	$ (0.73)		$ 0.08		$ 0.03
Diluted earnings (loss) per share	$ 2.55		$ 3.47	[2]	$ 2.33
Dividends per share	$ 2.00		$ 0.80		$ 0.60
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	269.9		269.7		269.4
Diluted	270.6		270.2		269.8

[1] Net income in the first quarter of 2014 includes the impairment loss on the sale of CAC.

[2] Due to the averaging of shares, quarterly earnings per share do not add to the total for the full year.