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STOCK INCENTIVE PLANS - Performance Shares and Restricted Stock Units (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-Based Compensation Arrangement By Share-Based Payment Award, Conversion Ratio	1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at beginning of period (in shares) | shares	57,236	57,533	117,979
Issued (in shares) | shares	47,264	32,194	31,553
Cancelled (in shares) | shares	(13,108)	(6,835)	(7,659)
Vested (in shares) | shares	(18,232)	(25,656)	(84,340)
Outstanding at end of period (in shares) | shares	73,160	57,236	57,533
Weighted Average Price Per Share [Abstract]
Outstanding at beginning of period, weighted average price per share (in dollars per share) | $ / shares	$ 220.00	$ 185.02	$ 141.86
Issued, weighted average price per share (in dollars per share) | $ / shares	227.26	242.65	191.36
Cancelled, weighted average price per share (in dollars per share) | $ / shares	215.01	190.90	148.25
Vested, weighted average price per share (in dollars per share) | $ / shares	191.36	177.75	130.35
Outstanding at end of period, weighted average price per share (in dollars per share) | $ / shares	$ 232.72	$ 220.00	$ 185.02
Unearned unrecognized compensation | $	$ 11
Weighted average period to recognize (in years)	3 years 2 months 12 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Conversion Ratio	1
Share-Based Compensation Vested Fair Value | $	$ 26	$ 29	$ 29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at beginning of period (in shares) | shares	560,351	739,717	978,888
Issued (in shares) | shares	104,220	103,427	139,529
Cancelled (in shares) | shares	(38,124)	(51,410)	(54,533)
Vested (in shares) | shares	(193,664)	(231,383)	(324,167)
Outstanding at end of period (in shares) | shares	432,783	560,351	739,717
Weighted Average Price Per Share [Abstract]
Outstanding at beginning of period, weighted average price per share (in dollars per share) | $ / shares	$ 182.40	$ 154.09	$ 118.60
Issued, weighted average price per share (in dollars per share) | $ / shares	234.21	248.12	248.28
Cancelled, weighted average price per share (in dollars per share) | $ / shares	219.74	170.98	141.48
Vested, weighted average price per share (in dollars per share) | $ / shares	133.56	123.82	89.62
Outstanding at end of period, weighted average price per share (in dollars per share) | $ / shares	$ 213.45	$ 182.40	$ 154.09
Unearned unrecognized compensation | $	$ 41
Weighted average period to recognize (in years)	3 years
Minimum [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Maximum [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	7 years

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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