STOCK-BASED COMPENSATION (Stock Option Plans) (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) yr $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Total Compensation Expense	$ 359	$ 261	$ 352
Stock-based compensation expense related tax benefit	$ 133	$ 97	$ 129
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Weighted-average fair value per share of options granted \| $ / shares	$ 14.44	$ 10.95	$ 11.61
Total Compensation Expense	$ 37	$ 32	$ 55
Stock-based compensation expense related tax benefit	14	12	20
Total amount of cash received from the exercise of options	310	312	377
Total intrinsic value of options exercised	286	153	175
Unrecognized Compensation Cost	$ 15
Employee Service Share-based Compensation, Nonvested, Total Compensation Cost not yet recognized and period for recognition in years \| yr	1.65
Maximum term by share based compensation after vesting	10 years
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 106	57	65
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Maximum term by share based compensation after vesting	10 years
Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Total Compensation Expense	$ 178	97	110
Stock-based compensation expense related tax benefit	66	$ 36	$ 41
Unrecognized Compensation Cost	$ 165
Employee Service Share-based Compensation, Nonvested, Total Compensation Cost not yet recognized and period for recognition in years \| yr	1.64
Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised, shares \| shares	(616,000)	(861,000)	(327,000)
Total Compensation Expense	$ 106	$ 125	$ 172
Stock-based compensation expense related tax benefit	39	$ 46	$ 63
Unrecognized Compensation Cost	$ 15
Employee Service Share-based Compensation, Nonvested, Total Compensation Cost not yet recognized and period for recognition in years \| yr	1.66
2012 Stock Incentive Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares	29,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, shares, beginning balance \| shares	34,770,000
Outstanding, exercise price, beginning balance \| $ / shares	$ 36.20
Granted, shares \| shares	2,221,000
Granted, exercise price \| $ / shares	$ 61.19
Exercised, shares \| shares	(10,194,000)
Exercised, exercise price \| $ / shares	$ 36.02
Forfeited/Expired, shares \| shares	(169,000)
Forfeited/Expired, exercise price \| $ / shares	$ 43.75
Outstanding, shares, ending balance \| shares	26,628,000	34,770,000
Outstanding, exercise price, ending balance \| $ / shares	$ 38.30	$ 36.20
Remaining contractual life in years \| yr	5.10
Aggregate intrinsic value in millions	$ 877
Options exercisable at end of period, shares \| shares	22,019,000
Options exercisable at end of year, weighted average exercise price \| $ / shares	$ 35.16
Options exercisable at end of year, weighted average remaining contractual term (years) \| yr	4.43
Option exercisable aggregate intrinsic value in millions	$ 794
January 1, 2013 - December 31, 2015 [Member] \| Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Actual number of shares granted above target minimum range	0.00%
Actual number of shares granted above target maximum range	200.00%
Minimum [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Minimum [Member] \| Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Vested Award but not issued as of period end and expected date of issuance	1 year
Minimum [Member] \| Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Maximum [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Maximum [Member] \| Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Vested Award but not issued as of period end and expected date of issuance	3 years
Maximum [Member] \| Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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