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	Dec. 31, 2016	Dec. 31, 2015
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	$ 79	$ 109
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)
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	(49)	(43)
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	$ 2,855	$ 2,835