Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Net earned premiums	$ 7,271	$ 6,882	$ 6,603
Net investment income	2,450	2,282	2,054
Net realized investment gains (losses):
Other-than-temporary impairment losses	(76)	(129)	(175)
Portion of other-than-temporary impairments recognized in Other comprehensive income (loss)	(2)	(25)	(41)
Net other-than-temporary impairment losses recognized in earnings	(78)	(154)	(216)
Other net realized investment gains (loss)	109	217	214
Net realized investment gains (losses)	31	63	(2)
Other revenues	361	320	294
Total revenues	10,113	9,547	8,949
Claims, Benefits and Expenses
Insurance claims and policyholders’ benefits	5,947	5,896	5,489
Amortization of deferred acquisition costs	1,362	1,274	1,176
Other operating expenses	1,325	1,335	1,238
Interest	166	170	175
Total claims, benefits and expenses	8,800	8,675	8,078
Income (loss) from continuing operations before income tax	1,313	872	871
Income tax (expense) benefit	(376)	(244)	(242)
Income (loss) from continuing operations	937	628	629
Income (loss) from discontinued operations, net of income tax (expense) benefit of -,- and $0			(1)
Net income (loss)	937	628	628
Net (income) loss attributable to noncontrolling interests			(16)
Net income (loss) attributable to CNA	$ 937	$ 628	$ 612
Basic Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations attributable to CNA	$ 3.48	$ 2.33	$ 2.27
Income (loss) from discontinued operations attributable to CNA
Basic earnings (loss) per share attributable to CNA common stockholders	$ 3.48	$ 2.33	$ 2.27
Diluted Earnings (Loss) Per Share Attributable to CNA
Income (loss) from continuing operations attributable to CNA	$ 3.47	$ 2.33	$ 2.27
Income (loss) from discontinued operations attributable to CNA
Diluted earnings (loss) per share attributable to CNA common stockholders	$ 3.47	$ 2.33	$ 2.27
Dividends per share	$ 0.80	$ 0.60	$ 0.40
Weighted Average Outstanding Common Stock and Common Stock Equivalents
Basic	269.7	269.4	269.3
Diluted	270.2	269.8	269.6