SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Interest Income and Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Supplemental Income Statement Elements [Abstract] | ||||
| Interest expense | $ 198 | $ 181 | $ 571 | $ 513 |
| Interest income | 46 | 49 | 140 | 129 |
| Capitalized interest costs | $ 6 | $ 7 | $ 18 | $ 21 |