EMPLOYEE BENEFIT PLANS - Employee Retirement Plans (Details) $ in Millions |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2018
USD ($)
plan
|
Mar. 31, 2017
USD ($)
plan
|
|
| Employee Retirement Plans | ||
| Number of frozen plans | plan | 1 | 1 |
| Salaries, wages and benefits expense | ||
| Employee Retirement Plans | ||
| Service costs | $ 1 | $ 1 |
| Other non-operating income (expense), net | ||
| Employee Retirement Plans | ||
| Other components | $ 4 | $ 7 |