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LONG-TERM DEBT - SCHEDULE (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016 | Apr. 30, 2016 | Jun. 30, 2015
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LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 9,907 | $ 9,907 |  |  |
Unamortized discount, net | (32) | (36) |  |  |
Debt issuance costs | (47) | (52) |  |  |
Current maturities | (500) |  |  |  |
Total long-term debt | 9,328 | 9,819 |  |  |
1.50% senior notes due 2018 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 500 | $ 500 |  |  |
Debt instrument interest rate stated percentage | 1.50% | 1.50% |  |  |
9.25% senior debentures due 2019 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 116 | $ 116 |  |  |
Debt instrument interest rate stated percentage | 9.25% | 9.25% |  |  |
4.10% senior notes due 2021 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 1,249 | $ 1,249 |  |  |
Debt instrument interest rate stated percentage | 4.10% | 4.10% |  |  |
3.125% senior notes due 2022 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 813 | $ 813 |  |  |
Debt instrument interest rate stated percentage | 3.125% | 3.125% |  |  |
2.60% senior notes due 2022 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 400 | $ 400 |  |  |
Debt instrument interest rate stated percentage | 2.60% | 2.60% |  | 2.60% |
2.70% senior notes due 2023 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 1,191 | $ 1,191 |  |  |
Debt instrument interest rate stated percentage | 2.70% | 2.70% |  |  |
8.75% medium-term notes due 2023 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 22 | $ 22 |  |  |
Debt instrument interest rate stated percentage | 8.75% | 8.75% |  |  |
3.50% senior notes due 2025 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 750 | $ 750 |  |  |
Debt instrument interest rate stated percentage | 3.50% | 3.50% |  |  | 3.50%
3.40% senior notes due 2026 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 1,150 | $ 1,150 |  |  |
Debt instrument interest rate stated percentage | 3.40% | 3.40% |  | 3.40% |
3.00% senior notes due 2027 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 750 | $ 750 |  |  |
Debt instrument interest rate stated percentage | 3.00% | 3.00% | 3.00% |  |
7.20% senior debentures due 2028 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 82 | $ 82 |  |  |
Debt instrument interest rate stated percentage | 7.20% | 7.20% |  |  |
8.45% senior notes due 2029 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 116 | $ 116 |  |  |
Debt instrument interest rate stated percentage | 8.45% | 8.45% |  |  |
4.625% senior notes due 2045 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 750 | $ 750 |  |  |
Debt instrument interest rate stated percentage | 4.625% | 4.625% |  |  | 4.625%
4.40% senior notes due 2046 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 1,200 | $ 1,200 |  |  |
Debt instrument interest rate stated percentage | 4.40% | 4.40% |  | 4.40% |
4.10% senior notes due 2047 |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Long-term debt, gross | $ 750 | $ 750 |  |  |
Debt instrument interest rate stated percentage | 4.10% | 4.10% | 4.10% |  |
Variable rate bonds due 2030 (0.9% and 0.15% as of December 31, 2016 and 2015, respectively ) |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |
Variable interest rate (as a percent) | 1.80% | 0.90% |  |  |
Long-term debt, gross | $ 68 | $ 68 |  |  |

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