STOCK-BASED COMPENSATION (Deferred and Restricted Stock) (Details) $ / shares in Units, employees in Thousands, $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) yr employees $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, shares, beginning balance		0
Outstanding, shares, ending balance			0
Total Compensation Expense | $		$ 359	$ 261	$ 352
Stock-based compensation expense related tax benefit | $		$ 133	$ 97	$ 129
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Transfers Out, Grant Date Fair Value | $ / shares		$ 63.24
Nonvested Performance Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, shares, beginning balance		4,454,000
Nonvested, weighted average grant date fair value per share, beginning of period | $ / shares		$ 55.85
Granted, shares		1,960,000
Weighted-average grant date fair value per share, granted | $ / shares		$ 80.71
Canceled, shares		(131,000)
Weighted average grant date fair value per share, canceled | $ / shares		$ 58.91
Outstanding, shares, ending balance	232,000	232,000	4,454,000
Nonvested, weighted average grant date fair value per share, end of period | $ / shares	$ 71.16	$ 71.16	$ 55.85
Performance Deferred Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Transfers Out		(6,051,000)
Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost | $	$ 165	$ 165
Employee Service Share-based Compensation, Nonvested, Total Compensation Cost not yet recognized and period for recognition in years | yr		1.64
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Issued		20,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, shares, beginning balance		6,382,000
Nonvested, weighted average grant date fair value per share, beginning of period | $ / shares		$ 47.49
Granted, shares		1,709,000
Weighted-average grant date fair value per share, granted | $ / shares		$ 61.29	$ 46.25	$ 49.42
Vested, shares		(2,804,000)
Weighted-average fair value per share of deferred stock granted vested | $ / shares		$ 47.60
Canceled, shares		(112,000)
Weighted average grant date fair value per share, canceled | $ / shares		$ 50.14
Outstanding, shares, ending balance	13,346,000	13,346,000	6,382,000
Nonvested, weighted average grant date fair value per share, end of period | $ / shares	$ 50.71	$ 50.71	$ 47.49
Total fair value of deferred stock vested and delivered | $		$ 179	$ 166	$ 162
Total fair value of deferred stock vested and delivered, related tax benefit | $		66	61	60
Total Compensation Expense | $		178	97	110
Stock-based compensation expense related tax benefit | $		$ 66	36	41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested But Not Issued, Weighted Average Grant Date Fair Value | $ / shares		$ 35.99
Deferred Compensation, Share-based Payments [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Transfers In		8,171,000
Share-Based Compensation Arrangement y Share-Based Payment ward, Equity Instruments Other then Options, Transfers In, Grant Date Fair Value | $ / shares		$ 49.94
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | $		$ 25
Share-Based Compensation Arrangement By Share-Based Payment Award, Plan Modification, Incremental Allocated Share-Based Compensation Expense | $	$ 20	$ 5
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Number of Employees Affected | employees		5
Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost | $	$ 15	$ 15
Employee Service Share-based Compensation, Nonvested, Total Compensation Cost not yet recognized and period for recognition in years | yr		1.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Total fair value of deferred stock vested and delivered | $		$ 202	103	37
Employee Service Share-based Compensation, Tax Benefit Realized from Vesting of Performance Deferred Stock Awards | $		75	38	14
Total Compensation Expense | $		106	125	172
Stock-based compensation expense related tax benefit | $		$ 39	$ 46	$ 63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		616,000	861,000	327,000
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards | $		$ 38	$ 40	$ 16
Non-Employee Directors' Stock Incentive Plan 2012 [Member] | Restricted Stock [Member]
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		$ 50.55	$ 51.51
Nonvested, weighted average grant date fair value per share, end of period | $ / shares	$ 62.04	$ 62.04	$ 50.55	$ 51.51
Deferred Compensation Arrangement with Individual, Shares Issued		33,000	32,000	32,000
Maximum [Member] | Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested Award but not issued as of period end and expected date of issuance		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Maximum [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Minimum [Member] | Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested Award but not issued as of period end and expected date of issuance		1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Minimum [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
September 1, 2017 - August 31, 2019 [Member] [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares		232,000
Weighted-average grant date fair value per share, granted | $ / shares		$ 71.16
January 1, 2016 - December 31, 2018 [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares		1,728,000
Weighted-average grant date fair value per share, granted | $ / shares		$ 81.99
January 1, 2015 - December 31, 2017 [Member] [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares			2,283,000
Weighted-average grant date fair value per share, granted | $ / shares			$ 52.68
January 1, 2014 - December 31, 2016 [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual number of shares granted above target minimum range		0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, shares				2,258,000
Weighted-average grant date fair value per share, granted | $ / shares				$ 59.08
Actual number of shares granted above target maximum range		200.00%
January 1, 2013 - December 31, 2015 [Member] | Performance Deferred Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual number of shares granted above target minimum range		0.00%
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 maximum range		200.00%