v3.8.0.1

Investments (Allowance for Credit Losses and Recorded Investment in Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for credit losses:
Individually evaluated for impairment	$ 7	$ 6
Collectively evaluated for impairment	99	100
Total ending balance	106	106	$ 112
Recorded Investment:
Individually evaluated for impairment	116	148
Collectively evaluated for impairment	56,035	52,737
Total ending balance	56,151	52,885
Commercial Mortgage Loans
Allowance for credit losses:
Individually evaluated for impairment	7	6
Collectively evaluated for impairment	90	90
Total ending balance	97	96	97
Recorded Investment:
Individually evaluated for impairment	75	116
Collectively evaluated for impairment	52,009	48,911
Total ending balance	52,084	49,027
Agricultural Property Loans
Allowance for credit losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3	2
Total ending balance	3	2	2
Recorded Investment:
Individually evaluated for impairment	39	30
Collectively evaluated for impairment	3,164	2,928
Total ending balance	3,203	2,958
Residential property loans
Allowance for credit losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1	2
Total ending balance	1	2	3
Recorded Investment:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	196	252
Total ending balance	196	252
Other collateralized loans
Allowance for credit losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Total ending balance	0	0	0
Recorded Investment:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	5	10
Total ending balance	5	10
Uncollateralized loans
Allowance for credit losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	5	6
Total ending balance	5	6	$ 10
Recorded Investment:
Individually evaluated for impairment	2	2
Collectively evaluated for impairment	661	636
Total ending balance	$ 663	$ 638

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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