Quarterly report pursuant to Section 13 or 15(d)

BENEFIT PLANS - Net Periodic Benefit Cost (Details)

v3.10.0.1
BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Benefits        
Components of net periodic benefit expense [Abstract]        
Service cost $ 0 $ 0 $ 2 $ 2
Interest cost 9 8 23 22
Expected return on plan assets (12) (13) (36) (41)
Amortization of prior service cost 0 0 0 0
Amortization of gain (loss) 2 1 6 5
Settlements 1 4 6 10
Net periodic (benefit) cost 0 0 1 (2)
Post Retirement Benefits        
Components of net periodic benefit expense [Abstract]        
Service cost 0 0 0 0
Interest cost 0 0 0 0
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (1) 0 (2) (1)
Amortization of gain (loss) 0 0 0 0
Settlements 0 0 0 0
Net periodic (benefit) cost $ (1) $ 0 $ (2) $ (1)