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Insurance - Liabilities for excess benefits expected to be paid on future deaths and annuitizations, guaranteed withdrawal benefits and accrued persistency and premium bonuses (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Insurance [Abstract]
Expected death and annuitization	$ 228	$ 223
Guaranteed withdrawal benefits	357	278
Accrued persistency and premium bonuses	$ 3	$ 6

X

- Definition

Amount of expected sales inducements that are to be recognized as part of the liability in excess of the projected account balances for persistency and premium bonuses without adjustments for anticipated lapses or decrements, as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of reserves required for contracts that provide additional benefits in excess of the projected account balances that are payable only upon future deaths and annuitizations, as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 1
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473

+ Details

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