Income Taxes (Principal Components Of Net Deferred Tax Balances) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Net operating loss carryforward	$ 181	$ 137
Future policy benefits payable	179	153
Benefits payable	111	89
Compensation and other accrued expenses	95	127
Deferred acquisition costs	35	34
Capital loss carryforward	13	13
Unearned premiums	11	10
Other	20	19
Total deferred income tax assets	645	582
Valuation allowance	(28)	(28)
Total deferred income tax assets, net of valuation allowance	617	554
Depreciable property and intangible assets	(347)	(276)
Investment securities	(191)	(66)
Prepaid expenses	(49)	(47)
Total deferred income tax liabilities	(587)	(389)
Total net deferred income tax assets	30	165
Other current assets	0	76
Other long-term assets	46	89
Trade accounts payable and accrued expenses	$ (16)	$ 0