Consolidated Balance Sheet Parentheticals (Parentheticals) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Fixed maturities securities at amortized cost	$ 37,838	$ 37,253
Equity securities at cost	117	191
Allowance for uncollectible reinsurance receivables	37	38
Allowance for uncollectible insurance receivables	45	51
Accumulated depreciation on property and equipment	224	382
Due from Parent Company	2	0
Due to Parent Company	$ 12	$ 82
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	270,483,164	270,274,361
Treasury stock, shares	2,557,079	2,765,882