GOODWILL (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Goodwill Disclosure
Number of steps involved in process of impairment test \| item	2
Goodwill
Goodwill - gross	$ 5,090	$ 4,931	$ 4,952
Accumulated impairments	(3,477)	(3,477)	(3,477)
Net goodwill	1,613	1,454	1,475
Increase (decrease) due to:
Acquisition		208	28
Other	(73)	(49)	(49)
Dispositions	(12)
Goodwill - gross	5,005	5,090	4,931
Accumulated impairments	(3,477)	(3,477)	(3,477)
Net goodwill	1,528	1,613	1,454
Goodwill Reallocation	(132)
Liability And Financial Lines [Member]
Goodwill
Goodwill - gross	1,576	1,626	1,675
Accumulated impairments	(797)	(797)	(797)
Net goodwill	779	829	878
Increase (decrease) due to:
Other	(137)	(50)	(49)
Goodwill - gross	1,439	1,576	1,626
Accumulated impairments	(797)	(797)	(797)
Net goodwill	642	779	829
Property And Special Risks [Member]
Goodwill
Goodwill - gross	719	623	623
Accumulated impairments	(392)	(392)	(392)
Net goodwill	327	231	231
Increase (decrease) due to:
Acquisition		96
Other	67
Dispositions	(12)
Goodwill - gross	774	719	623
Accumulated impairments	(392)	(392)	(392)
Net goodwill	382	327	231
Personal Insurance [Member]
Goodwill
Goodwill - gross	2,472	2,472	2,472
Accumulated impairments	(2,211)	(2,211)	(2,211)
Net goodwill	261	261	261
Increase (decrease) due to:
Goodwill - gross	2,472	2,472	2,472
Accumulated impairments	(2,211)	(2,211)	(2,211)
Net goodwill	261	261	261
Life Insurance [Member]
Goodwill
Goodwill - gross	77	21
Accumulated impairments	0	0
Net goodwill	77	21
Increase (decrease) due to:
Acquisition		55	21
Other		1
Goodwill - gross	77	77	21
Accumulated impairments	0	0	0
Net goodwill	77	77	21
Legacy Property And Casualty Run Off Insurance Lines [Member]
Increase (decrease) due to:
Goodwill Reallocation	75
Legacy Life Insurance Run Off Lines [Member]
Increase (decrease) due to:
Goodwill Reallocation	57
Other Operations
Goodwill
Goodwill - gross	27	7
Accumulated impairments	0	0
Net goodwill	27	7
Increase (decrease) due to:
Acquisition		20	7
Goodwill - gross	27	27	7
Accumulated impairments	0	0	0
Net goodwill	27	27	7
Legacy portfolio [Member]
Goodwill
Goodwill - gross	219	182	182
Accumulated impairments	(77)	(77)	(77)
Net goodwill	142	105	105
Increase (decrease) due to:
Acquisition		37
Other	(3)
Goodwill - gross	216	219	182
Accumulated impairments	(77)	(77)	(77)
Net goodwill	$ 139	$ 142	$ 105

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Amount of goodwill reallocated into (out of) a reporting unit as a result of segment changes.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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