Insurance (Guarantees Related to Universal and Variable Life Contracts) (Details) (Universal And Variable Life Contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Secondary Guarantees [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Account value (general and separate account)	$ 16,355	$ 16,048
Net amount at risk	184,884	185,920
Average attained age of policyholders	56 years	55 years
Paid-Up Guarantees [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Account value (general and separate account)	3,669	3,700
Net amount at risk	$ 21,387	$ 21,737
Average attained age of policyholders	60 years	60 years