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DEBT (Senior Notes Offering) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized discount |  |  | $ 16 |  |  |
Cash and cash equivalents |  |  | $ 133 | $ 192 | $ 187 | $ 296
2015 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt | $ 1,200 |  |  |  |  |
Debt issuance cost | 11 |  |  |  |  |
2.50% Senior Notes due March 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt | $ 300 |  |  |  |  |
Debt instrument, interest rate | 2.50% |  | 2.50% |  |  |
Unamortized discount | $ 1 |  |  |  |  |
Debt instrument, maturity date |  |  | Mar. 30, 2020 |  |  |
3.50% Senior Notes due March 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt | $ 600 |  |  |  |  |
Debt instrument, interest rate | 3.50% |  | 3.50% |  |  |
Debt instrument, maturity date |  |  | Mar. 30, 2025 |  |  |
4.70% Senior Notes due March 2045 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt | $ 300 |  |  |  |  |
Debt instrument, interest rate | 4.70% |  | 4.70% |  |  |
Debt instrument, maturity date |  |  | Mar. 30, 2045 |  |  |
2.70% Senior Notes due April 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  | 2.70% |  |  |
Debt instrument, maturity date |  |  | Apr. 01, 2019 |  |  |
4.25% Senior Notes due April 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  | 4.25% |  |  |
Debt instrument, maturity date |  |  | Apr. 01, 2024 |  |  |
Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt |  | $ 600 |  |  |  |
Debt issuance cost |  | 5 |  |  |  |
Unamortized discount |  | 1 |  |  |  |
Senior Notes [Member] | 2.70% Senior Notes due April 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt |  | $ 300 |  |  |  |
Debt instrument, interest rate |  | 2.70% |  |  |  |
Senior Notes [Member] | 4.25% Senior Notes due April 2024 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt |  | $ 300 |  |  |  |
Debt instrument, interest rate |  | 4.25% |  |  |  |

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