SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 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	$ 13	$ 14	$ 57	$ 50
Tax benefit related to share-based compensation costs incurred	3	3	20	11
Fair value - vested during period			125	66
Unrecognized share-based compensation costs	99	104	$ 99	104
Unrecognized share-based compensation costs - weighted average period expected to be recognized			2 years 6 months 12 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	$ 18	$ 34	$ 18	$ 34
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		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		$ 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		45,000
Restricted Stock Units (RSUs) [Member]
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items]
Tax benefit related to share-based compensation costs incurred			$ 7
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)			525,000
Vested (in shares)			(881,000)
Forfeited (in shares)			(69,000)
Nonvested restricted stock (in shares) - end of period	1,168,000		1,168,000
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)			64.22
Weighted average grant date fair value - vested (in usd per share)			47.37
Weighted average grant date fair value - forfeited (in usd per share)			54.66
Weighted average grant date fair value - end of period (in usd per share)	$ 57.08		$ 57.08
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)			427,000
Vested (in shares)			(755,000)
Forfeited (in shares)			(60,000)
Nonvested restricted stock (in shares) - end of period	1,004,000		1,004,000
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