Insurance (Details 2) (Universal and Variable Life Contracts [Member], USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012 Age	Dec. 31, 2011 Age
Secondary Guarantees [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Account value (general and separate account)	$ 13,588	$ 12,946
Net amount at risk	190,287	188,642
Average attained age of policyholders	54	53
Paid-Up Guarantees [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Account value (general and separate account)	3,895	3,963
Net amount at risk	$ 24,107	$ 24,991
Average attained age of policyholders	59	59