Statutory Information and Restrictions (Effects on statutory surplus compared to NAIC statutory surplus) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
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		$ 24	$ 36
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)	(55)
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	[1]	1,947	1,959
LLC Notes And Variable Value Surplus Notes [Member]
Statutory Accounting Practices [Line Items]
Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices	[1]	1,648	1,634
Excess Of Loss Reinsurance Treaties [Member]
Statutory Accounting Practices [Line Items]
Effects on statutory surplus compared to NAIC statutory surplus from the use of prescribed and permitted practices	[1]	$ 419	$ 330

[1] These permitted practices are related to structures that continue to be allowed in accordance with the grandfathered structures under the provisions of AG48 or are compliant under AG48 requirements.