v3.8.0.1

Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 106	$ 112
Addition to (release of) allowance for losses	1	(6)
Charge-offs, net of recoveries	(1)	(1)
Change in foreign exchange	0	1
Total ending balance	106	106
Commercial Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	96	97
Addition to (release of) allowance for losses	2	0
Charge-offs, net of recoveries	(1)	(1)
Change in foreign exchange	0	0
Total ending balance	97	96
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	2	2
Addition to (release of) allowance for losses	1	0
Charge-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Total ending balance	3	2
Residential property loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	2	3
Addition to (release of) allowance for losses	(1)	(1)
Charge-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Total ending balance	1	2
Other collateralized loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	0	0
Addition to (release of) allowance for losses	0	0
Charge-offs, net of recoveries	0	0
Change in foreign exchange	0	0
Total ending balance	0	0
Uncollateralized loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	6	10
Addition to (release of) allowance for losses	(1)	(5)
Charge-offs, net of recoveries	0	0
Change in foreign exchange	0	1
Total ending balance	$ 5	$ 6

X

- Definition

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- 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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