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Equity - Statutory Results (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statutory Accounting Practices [Line Items]
Statutory Net Income	$ 253	$ 861	$ 2,025
Statutory Capital	12,977	14,283
Group Benefits Insurance Subsidiary
Statutory Accounting Practices [Line Items]
Statutory Net Income	(1,066)	208	168
Statutory Capital	2,029	1,624
Property and Casualty Insurance Subsidiaries
Statutory Accounting Practices [Line Items]
Statutory Net Income	950	304	1,486
Statutory Capital	7,396	8,261
Life and Annuity Run-Off Business
Statutory Accounting Practices [Line Items]
Statutory Net Income	369	349	$ 371
Statutory Capital	$ 3,552	$ 4,398

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+ References

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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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