Consolidated Investment Entities - Maximum Exposure to Loss (Details) - Nonconsolidated VIEs - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fixed maturities, available-for-sale
Variable Interest Entity [Line Items]
Carrying Amount	$ 321	$ 110
Maximum exposure to loss	321	110
Limited partnerships/corporations, at fair value
Variable Interest Entity [Line Items]
Carrying Amount	784	759
Maximum exposure to loss	$ 784	$ 759

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685

+ Details

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Balance Type:	credit
Period Type:	instant

- 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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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Details

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- Details

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- Details

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