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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, 2017	Dec. 31, 2016
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		$ 54	$ 79
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		(50)	(49)
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]	1,965	$ 2,855
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]	1,585
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]	$ 185
[1] These permitted practices are related to structures that continue to be allowed in accordance with the grandfathered structures under the provisions of AG48.

X

- Definition

Amount of an item which resulted in a difference from applying state prescribed or permitted statutory accounting practices rather than statutory accounting practices prescribed by National Association of Insurance Commissioners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24746-158529

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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