Condensed Consolidated Balance Sheet (Unaudited) Parentheticals (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Balance Sheets Parenthetical [Abstract]
Fixed maturities securities at amortized cost	$ 39,129	$ 38,170
Equity securities at cost	189	228
Allowance for uncollectible reinsurance receivables	72	73
Allowance for uncollectible insurance receivables	90	101
Accumulated depreciation on property and equipment	358	404
Other assets receivable from Loews Corporation		4
Other liabilities payable to Loews Corporation	$ 129
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	273,040,243	273,040,243
Common stock, shares outstanding	269,701,999	269,399,390
Treasury stock, shares	3,338,244	3,640,853