Expenses Associated With Long-Duration Insurance Products (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Long Duration Insurance Products [Line Items]
Percent of consolidated premiums and services revenues related to long-duration insurance products			2.00%
Benefit expense with future policy benefits payable			$ 127	$ 306	$ 73
Amortization of deferred acquisition costs			34	198	52
Write-down of deferred acquisition costs		147.0		147.0
Charge related to closed block of long-term care policies	139			139
Increase in future policy benefits payable	170			170
Increase in reinsurance recoverable	31			31
Deferred acquisition costs associated with our individual major medical policies	36		54	36
Future policy benefits payable	1,493		1,663	1,493
Coinsurance Agreements [Member]
Long Duration Insurance Products [Line Items]
Future policy benefits payable	229		224	229
Closed Block Long-term Care Policies [Member]
Long Duration Insurance Products [Line Items]
Future policy benefits payable	825		938	825
Individual Major Medical Policies [Member]
Long Duration Insurance Products [Line Items]
Future policy benefits payable	$ 180		$ 233	$ 180