SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restricted Stock And Restricted Stock Units [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Share based compensation expense incurred	$ 29	$ 17
Tax benefit related to share-based compensation costs incurred	7	4
Fair value - vested during period	120	57
Unrecognized share-based compensation costs	$ 130
Unrecognized share-based compensation costs - weighted average period expected to be recognized	2 years 10 months 22 days
Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Liability for cash-settled units	$ 9	$ 22
Performance Based Restricted Stock and Restricted Stock Units [Member] | Share Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock (in shares) - beginning of period	283,000
Granted (in shares)	87,000
Vested (in shares)	(119,000)
Forfeited (in shares)	0
Nonvested restricted stock (in shares) - end of period	251,000
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)	$ 51.27
Weighted average grant date fair value - granted (in usd per share)	64.58
Weighted average grant date fair value - vested (in usd per share)	49.14
Weighted average grant date fair value - forfeited (in usd per share)	0.00
Weighted average grant date fair value - end of period (in usd per share)	$ 56.88
Performance Based Restricted Stock and Restricted Stock Units [Member] | Cash Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock (in shares) - beginning of period	68,000
Granted (in shares)	15,000
Vested (in shares)	(38,000)
Forfeited (in shares)	0
Nonvested restricted stock (in shares) - end of period	45,000
Service Based Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock (in shares) - beginning of period	1,593,000
Granted (in shares)	504,000
Vested (in shares)	(839,000)
Forfeited (in shares)	(9,000)
Nonvested restricted stock (in shares) - end of period	1,249,000
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract]
Weighted average grant date fair value - beginning of period (in usd per share)	$ 48.88
Weighted average grant date fair value - granted (in usd per share)	64.16
Weighted average grant date fair value - vested (in usd per share)	47.26
Weighted average grant date fair value - forfeited (in usd per share)	50.57
Weighted average grant date fair value - end of period (in usd per share)	$ 56.63
Service Based Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Nonvested restricted stock (in shares) - beginning of period	1,392,000
Granted (in shares)	407,000
Vested (in shares)	(725,000)
Forfeited (in shares)	(9,000)
Nonvested restricted stock (in shares) - end of period	1,065,000
2014 Long Term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Fair value - vested during period	$ 44
Cliff Vesting [Member] | 2014 Long Term Equity Compensation Plan [Member] | Restricted Stock And Restricted Stock Units [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Cliff Vesting [Member] | 2014 Long Term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Share Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Vested (in shares)	(313,391)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Cliff Vesting [Member] | 2014 Long Term Equity Compensation Plan [Member] | Service Based Restricted Stock And Restricted Stock Units [Member] | Cash Settled [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward]
Vested (in shares)	(307,556)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years