Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Fixed maturity securities at fair value (amortized cost of $37,945 and $37,345)	$ 42,305	$ 39,937
Equity securities at fair value (cost of $228 and $288)	260	304
Limited partnership investments	2,370	2,245
Other invested assets	11	12
Mortgage loans	358	234
Short term investments	2,484	1,641
Total investments	47,788	44,373
Cash	129	75
Reinsurance receivables (less allowance for uncollectible receivables of $74 and $91)	5,840	6,001
Insurance receivables (less allowance for uncollectible receivables of $102 and $112)	1,902	1,614
Accrued investment income	484	436
Deferred acquisition costs	603	552
Deferred income taxes	8	415
Property and equipment at cost (less accumulated depreciation of $408 and $420)	317	309
Goodwill and other intangible assets	285	139
Other assets (includes $0 and $130 due from Loews Corporation)	911	779
Separate account business	345	417
Total assets	58,612	55,110
Liabilities and Equity
Claim and claim adjustment expenses	24,331	24,303
Unearned premiums	3,681	3,250
Future policy benefits	10,974	9,810
Policyholders’ funds	165	191
Participating policyholders’ funds	71	68
Short term debt	13	83
Long term debt	2,557	2,525
Other liabilities (includes $87 and $0 due to Loews Corporation)	3,815	2,975
Separate account business	345	417
Total liabilities	45,952	43,622
Commitments and contingencies (Notes D, H and J)
Equity:
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 269,397,139 and 269,274,900 shares outstanding)	683	683
Additional paid-in capital	2,144	2,141
Retained earnings	8,823	8,308
Accumulated other comprehensive income (loss)	1,130	480
Treasury stock (3,643,104 and 3,765,343 shares), at cost	(99)	(102)
Notes receivable for the issuance of common stock	(21)	(22)
Total CNA stockholders’ equity	12,660	11,488
Total liabilities and equity	$ 58,612	$ 55,110