VARIABLE INTEREST ENTITIES AND PREFERRED SECURITIES OF SUBSIDIARIES Narrative (Details) $ in Millions	Mar. 31, 2018 USD ($)
2015 Financing Entities
Variable Interest Entity [Line Items]
Notes receivable, fair value disclosure	$ 4,680
Long-term debt, fair value	4,220
2007 Financing Entities
Variable Interest Entity [Line Items]
Notes receivable, fair value disclosure	2,220
Long-term debt, fair value	$ 2,070

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_NotesReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant