STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												5 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 01, 2015	May 04, 2006	May 03, 2006
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Preferred stock, par value	$ 1.00													$ 1.00
Preferred stock, shares outstanding	0													0
Common stock, par value	$ 0.01				$ 0.01									$ 0.01	$ 0.01			$ 0.01
Common stock, shares authorized	600,000,000				600,000,000									600,000,000	600,000,000			600,000,000	300,000,000
Dividends per common share	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.45	$ 0.40	$ 0.40	$ 0.40	$ 0.38	$ 0.38	$ 0.38	$ 0.38		$ 1.80	$ 1.65	$ 1.52
Stock repurchase program, remaining authorized repurchase amount	$ 917													$ 917
Treasury stock value acquired cost method														$ 465	$ 590	$ 224
Reissuance of shares for employee benefit plan														2,000,000	2,000,000	1,000,000
Sale of noncontrolling interest in subsidiary														$ 4	$ 0	$ 63
Redeemable noncontrolling interest	80				$ 77									80	77
UMass Joint Venture [Member]
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners																	18.90%
Consideration																	$ 68
Redeemable noncontrolling interest	$ 80				77									$ 80	$ 77
Treasury Stock, at Cost
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Purchases of treasury stock, shares														4,600,000	7,400,000	3,200,000
Treasury stock value acquired cost method														$ 465	$ 590	$ 224
Share Repurchases Open Market [Member]
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Additional authorized amount					$ 1,000				$ 500						$ 1,000	$ 500
Accelerated Share Repurchase Program [Member]
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Purchases of treasury stock, shares						300,000	2,800,000						3,100,000		3,100,000
Treasury stock value acquired cost method													$ 250
Treasury stock acquired accelerated share repurchase, final purchase price, per share													$ 81.04
Maximum [Member]
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items]
Preferred stock, shares authorized	10,000,000													10,000,000