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Investment Holding Level 4 Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Investment Income [Line Items]
Net Investment Income	$ 2,961	$ 3,030	$ 3,154
Investment Income, Investment Expense	113	118	122
Fixed Maturities [Member]
Net Investment Income [Line Items]
Net Investment Income	2,379	2,409	2,420
Equity Securities [Member]
Net Investment Income [Line Items]
Net Investment Income	31	25	38
Mortgages [Member]
Net Investment Income [Line Items]
Net Investment Income	252	267	265
Policy Loans [Member]
Net Investment Income [Line Items]
Net Investment Income	83	82	80
Limited Partnerships and Other Alternative Investments [Member]
Net Investment Income [Line Items]
Net Investment Income	214	227	294
Other Investments [Member]
Net Investment Income [Line Items]
Net Investment Income	$ 115	$ 138	$ 179

X

- Definition

Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16(Column G))
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915

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