COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Rollforward of the Reserve (Details) - Disposed of by sale - WMC - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Loss Contingency Accrual
Balance, beginning of period	$ 342	$ 416	$ 626	$ 416	$ 626
Provision	5		10	5	10
Claim resolutions / rescissions	(53)		0	(127)	0
Balance, end of period	$ 294	$ 342	$ 636	$ 294	$ 636

Amount of loss contingency liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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