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Employee Service Share-based Compensation, Tax Benefit Realized from Vesting of Deferred Stock Awards.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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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 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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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The number of employees affected by the modification of an equity-based compensation plan.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.

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STOCK-BASED COMPENSATION (Deferred and Restricted Stock and Performance Stock) (Details) $ / shares in Units, employees in Thousands, $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) employees $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Additional Information about RSU's [Abstract]
Total Compensation Expense		$ 224	$ 359	$ 261
Stock-based compensation expense related tax benefit		50	133	97
Employee Stock Option
Additional Information about RSU's [Abstract]
Total Compensation Expense		68	37	32
Stock-based compensation expense related tax benefit		15	14	12
Unrecognized Compensation Cost		$ 36
Compensation Cost not yet recognized and period for recognition in years		1 year 10 months 28 days
Maximum term by share based compensation after vesting		10 years
Proceeds from Stock Options Exercised		$ 112	$ 310	$ 312
Deferred Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, shares, beginning balance \| shares		13,346,000
Nonvested, weighted average grant date fair value per share, beginning of period \| $ / shares		$ 50.71
Granted, shares \| shares		2,022,000
Weighted-average grant date fair value per share, granted \| $ / shares		$ 71.46	$ 61.29	$ 46.25
Vested, shares \| shares		(5,409,000)
Weighted-average fair value per share of deferred stock granted vested \| $ / shares		$ 46.04
Canceled, shares \| shares		(224,000)
Weighted average grant date fair value per share, canceled \| $ / shares		$ 59.40
Outstanding, shares, ending balance \| shares	13,346,000	9,735,000	13,346,000
Nonvested, weighted average grant date fair value per share, end of period \| $ / shares	$ 50.71	$ 57.41	$ 50.71
Additional Information about RSU's [Abstract]
Total fair value of deferred stock vested and delivered		$ 382	$ 179	$ 166
Total fair value of deferred stock vested and delivered, related tax benefit		86	66	61
Total Compensation Expense		144	178	97
Stock-based compensation expense related tax benefit		32	66	36
Unrecognized Compensation Cost		$ 126
Compensation Cost not yet recognized and period for recognition in years		1 year 8 months 5 days
Vested But Not Issued \| shares		18,000
Vested, Weighted Average Grant Date Fair Value \| $ / shares		$ 35.12
Deferred Compensation, Share-based Payments
Additional Information about RSU's [Abstract]
Plan Modification, Incremental Compensation Cost		$ 25
Plan Modification, Incremental Allocated Share-Based Compensation Expense	$ 20	$ 5
Plan Modification, Number of Employees Affected \| employees		5
Performance Deferred Stock Awards
Additional Information about RSU's [Abstract]
Total fair value of deferred stock vested and delivered		$ 0	202	103
Total Compensation Expense		12	106	125
Stock-based compensation expense related tax benefit		3	39	46
Unrecognized Compensation Cost		$ 8
Compensation Cost not yet recognized and period for recognition in years		8 months 1 day
Tax Benefit Realized from Vesting of Performance Deferred Stock Awards		$ 0	$ 75	$ 38
Exercised, shares \| shares		0	(616,000)	(861,000)
Cash used to settle awards		$ 0	$ 38	$ 40
Restricted Stock
Additional Information about RSU's [Abstract]
Maximum term by share based compensation after vesting		10 years
Restricted Stock \| Certain executive officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash, equal to the value of stock award to certain executives		$ 45
Number of shares to certain executives settled. \| shares		625,000	0	0
Non-Employee Directors' Stock Incentive Plan 2012 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, weighted average grant date fair value per share, beginning of period \| $ / shares		$ 62.04	$ 50.55
Nonvested, weighted average grant date fair value per share, end of period \| $ / shares	$ 62.04	$ 62.82	$ 62.04	$ 50.55
Additional Information about RSU's [Abstract]
Deferred Compensation Arrangement with Individual, Shares Issued \| shares		36,000	33,000	32,000
Maximum \| Employee Stock Option
Additional Information about RSU's [Abstract]
Award Vesting Period		3 years
Maximum \| Deferred Stock
Additional Information about RSU's [Abstract]
Vested Award but not issued as of period end and expected date of issuance		3 years
Award Vesting Period		3 years
Maximum \| Performance Deferred Stock Awards
Additional Information about RSU's [Abstract]
Award Vesting Period		3 years
Minimum \| Employee Stock Option
Additional Information about RSU's [Abstract]
Award Vesting Period		1 year
Minimum \| Deferred Stock
Additional Information about RSU's [Abstract]
Vested Award but not issued as of period end and expected date of issuance		1 year
Award Vesting Period		1 year
Minimum \| Performance Deferred Stock Awards
Additional Information about RSU's [Abstract]
Award Vesting Period		1 year
January 1, 2014 - December 31, 2016 \| Performance Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Actual number of shares granted above target minimum range		0.00%
Additional Information about RSU's [Abstract]
Actual number of shares granted above target maximum range		200.00%
Sep 1, 2017 – Aug 31, 2019 \| Performance Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares \| shares		232,000
Weighted-average grant date fair value per share, granted \| $ / shares		$ 71.16
Jan 1, 2017 – Dec 31, 2019 \| Performance Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares \| shares		1,728,000
Weighted-average grant date fair value per share, granted \| $ / shares		$ 81.99
Jan 1, 2016 – Dec 31, 2018 \| Performance Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares \| shares			2,283,000
Weighted-average grant date fair value per share, granted \| $ / shares			$ 52.68
January 1, 2013 - December 31, 2015 \| Performance Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Actual number of shares granted above target minimum range		0.00%
Additional Information about RSU's [Abstract]
Actual number of shares granted above target maximum range		200.00%