BASIS OF PRESENTATION AND ACCOUNTING CHANGES - Accounting Changes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Mar. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle
Addition (reduction) in Retained earnings	$ 117,852	$ 122,463
Other assets	122,122us-gaap_OtherAssets	136,040us-gaap_OtherAssets
Accounting Standards Update 2014-01
New Accounting Pronouncements or Change in Accounting Principle
Addition (reduction) in Retained earnings		(349)
Other assets		(178)
Addition (reduction) in deferred tax assets		(171)
Accounting Standards Update 2014-14
New Accounting Pronouncements or Change in Accounting Principle
Reclassification adjustment	$ 130

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Subparagraph (b),(c)

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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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

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-Article 7

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.31(a)(3))

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