COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Rollforward of the Reserve (Details) - Disposed of by sale - WMC - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Loss Contingency Accrual
Balance, beginning of period	$ 416	$ 626
Provision	0	0
Claim resolutions / rescissions	(74)	0
Balance, end of period	$ 342	$ 626

Amount of loss contingency liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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- Definition

Amount of increase (decrease) in loss contingency liability.

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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- Definition

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

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