Quarterly report pursuant to Section 13 or 15(d)

BENEFIT PLANS - Net Periodic Benefit Cost (Details)

v3.8.0.1
BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Benefits    
Components of net periodic benefit expense [Abstract]    
Service cost $ 1 $ 1
Interest cost 7 7
Expected return on plan assets (12) (14)
Amortization of prior service cost 0 0
Amortization of gain (loss) 2 2
Settlements 3 3
Net periodic (benefit) cost 1 (1)
Post Retirement Benefits    
Components of net periodic benefit expense [Abstract]    
Service cost 0 0
Interest cost 0 0
Expected return on plan assets 0 0
Amortization of prior service cost (1) 0
Amortization of gain (loss) 0 0
Settlements 0 0
Net periodic (benefit) cost $ (1) $ 0