Benefits Payable (Benefit Expenses Excluded From Activity In Benefits Payable) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Benefits Payable [Abstract]
Military services	$ 3,247	$ 3,059	$ 3,020
Future policy benefits	127	306	73
Total	$ 3,374	$ 3,365	$ 3,093