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DEBT (Long-Term Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2015 | Mar. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 3,651 | $ 3,742 |  |
Debt issuance costs | (25) | (20) |  |
Less: current portion of long-term debt | 159 | 518 |  |
Total long-term debt, net of current portion | 3,492 | 3,224 |  |
5.45% Senior Notes Due 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 0 | $ 500 |  |
Debt instrument, interest rate | 5.45% | 5.45% | 5.45% |
Debt instrument, maturity date | Nov. 01, 2015 | Nov. 01, 2015 |  |
3.20% Senior Notes Due 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 150 | $ 304 |  |
Debt instrument, interest rate | 3.20% |  | 3.20% |
Debt instrument, maturity date | Apr. 01, 2016 |  |  |
6.40% Senior Notes Due 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 0 | $ 375 |  |
Debt instrument, interest rate |  | 6.40% | 6.40% |
Debt instrument, maturity date |  | Jul. 01, 2017 |  |
2.70% Senior Notes due April 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 300 | $ 300 |  |
Debt instrument, interest rate | 2.70% |  |  |
Debt instrument, maturity date | Apr. 01, 2019 |  |  |
4.75% Senior Notes due January 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 522 | 524 |  |
Debt instrument, interest rate | 4.75% |  |  |
Debt instrument, maturity date | Jan. 30, 2020 |  |  |
2.50% Senior Notes due March 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 299 | 0 |  |
Debt instrument, interest rate | 2.50% |  |  | 2.50%
Debt instrument, maturity date | Mar. 30, 2020 |  |  |
4.70% Senior Notes due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 554 | 549 |  |
Debt instrument, interest rate | 4.70% |  |  |
Debt instrument, maturity date | Apr. 01, 2021 |  |  |
4.25% Senior Notes due April 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 313 | 311 |  |
Debt instrument, interest rate | 4.25% |  |  |
Debt instrument, maturity date | Apr. 01, 2024 |  |  |
3.50% Senior Notes due March 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 601 | 0 |  |
Debt instrument, interest rate | 3.50% |  |  | 3.50%
Debt instrument, maturity date | Mar. 30, 2025 |  |  |
6.95% Senior Notes Due 2037 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 247 | 421 |  |
Debt instrument, interest rate | 6.95% |  |  |
Debt instrument, maturity date | Jul. 01, 2037 |  |  |
5.75% Senior Notes Due 2040 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 368 | 439 |  |
Debt instrument, interest rate | 5.75% |  |  |
Debt instrument, maturity date | Jan. 30, 2040 |  |  |
4.70% Senior Notes due March 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 300 | 0 |  |
Debt instrument, interest rate | 4.70% |  |  | 4.70%
Debt instrument, maturity date | Mar. 30, 2045 |  |  |
Other Long-term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other | $ 22 | $ 39 |  |

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