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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2015 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Aug. 31, 2013 | Mar. 31, 2013 | May. 04, 2006 | May. 03, 2006
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  | $ 0.01 |
Common stock, shares authorized |  |  |  | 600,000,000 | 600,000,000 |  |  |  |  |  |  |  |  |  | 600,000,000 | 300,000,000
Dividend program |  | $ 0.30 | $ 0.30 | $ 0.38 | $ 0.33 | $ 0.30 | $ 0.38 | $ 0.38 | $ 0.38 | $ 0.33 | $ 0.33 | $ 0.33 |  | $ 0.30 |  |
Treasury stock value acquired cost method |  |  |  | $ 224 | $ 132 | $ 1,037 |  |  |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  | $ 972 |  |  |  |  |  |  |  |  |  |  |  |
Reissuance of shares for employee benefit plan |  |  |  | 1,000,000 | 2,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interest in subsidiary |  |  |  | $ 63 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
UMass Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration | $ 68 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interest in subsidiary | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  |  | $ 70 |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 18.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock value acquired cost method |  | $ 350 | $ 450 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  | 5,800,000 | 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired accelerated share repurchase, final purchase price, per share |  | $ 60.73 | $ 59.46 |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchases Open Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders’ Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional authorized amount |  |  |  | $ 500 |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
Treasury stock value acquired cost method |  |  |  | $ 224 | $ 132 | $ 237 |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, shares |  |  |  | 3,200,000 | 2,200,000 | 4,100,000 |  |  |  |  |  |  |  |  |  |

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