OTHER FINANCIAL DATA - SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based compensation expense, net of tax | $ 7 | $ 7 | $ 20 | $ 22 |
| TSR RSUs [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Equity awards, granted (in shares) | 373,070 | |||
| EPS RSUs [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Equity awards, granted (in shares) | 94,760 | |||
| Service-based RSUs [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Equity awards, granted (in shares) | 95,876 | |||
| RSUs [Member] | IENova Plans [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Equity awards, granted (in shares) | 378,367 | |||