Statutory Information and Restrictions (Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Calculation of reserves using the Indiana universal life method [Member]
Statutory accounting practices [Line Items]
Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices	$ 140	$ 219
Calculation of reserves using continuous CARVM [Member]
Statutory accounting practices [Line Items]
Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices	(1)	(2)
Conservative valuation rate on certain variable annuities [Member]
Statutory accounting practices [Line Items]
Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices	(39)	(30)
Lesser of LOC and XXX additional reserve as surplus [Member]
Statutory accounting practices [Line Items]
Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices	$ 2,751	$ 2,635