Quarterly report pursuant to Section 13 or 15(d)

BENEFIT PLANS - Net Periodic Benefit Cost (Details)

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BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension Benefits        
Components of net periodic benefit expense [Abstract]        
Service cost $ 1 $ 1 $ 2 $ 1
Interest cost 7 7 14 15
Expected return on plan assets (12) (14) (24) (28)
Amortization of prior service cost 0 0 0 0
Amortization of gain (loss) 2 2 4 4
Settlements 2 3 4 5
Net periodic (benefit) cost 0 (1) 0 (3)
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 0 (1) (1) (1)
Amortization of gain (loss) 0 0 0 0
Settlements 0 0 0 0
Net periodic (benefit) cost $ 0 $ (1) $ (1) $ (1)