PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Reconciliation of Pension Plan Assets (Details) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	$ 4,439	$ 4,159
Net realized gains (losses)	235	222
Net change in unrealized appreciation (depreciation)	435	265
Purchases	960	630
Sales	(1,055)	(769)
Settlements	(79)	(68)
Fair value of plan assets, ending	4,935	4,439
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	2,767	2,432
Net realized gains (losses)	164	70
Net change in unrealized appreciation (depreciation)	275	228
Purchases	743	612
Sales	(645)	(507)
Settlements	(79)	(68)
Fair value of plan assets, ending	3,225	2,767
Private equity and related funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	1,577	1,627
Net realized gains (losses)	90	146
Net change in unrealized appreciation (depreciation)	138	31
Purchases	188	18
Sales	(387)	(245)
Settlements	0	0
Fair value of plan assets, ending	1,606	1,577
Real estate and related funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	91	96
Net realized gains (losses)	(19)	6
Net change in unrealized appreciation (depreciation)	23	6
Purchases	29	0
Sales	(23)	(17)
Settlements	0	0
Fair value of plan assets, ending	101	91
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	4	4
Net realized gains (losses)	0	0
Net change in unrealized appreciation (depreciation)	(1)	0
Purchases	0	0
Sales	0	0
Settlements	0	0
Fair value of plan assets, ending	$ 3	$ 4

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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-SubTopic 30

-Section 35

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

This element represents the net excess or deficiency of the fair value of an investment (security, contract) over or under its cost (face amount, notional amount), respectively, which excess value or deficiency has not been recognized in earnings of the entity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 22

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- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

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