Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Plan Assets (Details)

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BENEFIT PLANS - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Summary of plan assets investments    
Fair value of plan assets $ 931 $ 828
Fair value of plan assets, Percentage 100.00% 100.00%
Municipal Bonds [Member]    
Summary of plan assets investments    
Fair value of plan assets $ 5 $ 0
Fair value of plan assets, Percentage 1.00% 0.00%
Mutual funds-money market    
Summary of plan assets investments    
Fair value of plan assets $ 7 $ 4
Fair value of plan assets, Percentage 1.00% 0.00%
U.S. Treasury securities    
Summary of plan assets investments    
Fair value of plan assets $ 0 $ 4
Fair value of plan assets, Percentage 0.00% 1.00%
Corporate obligations    
Summary of plan assets investments    
Fair value of plan assets $ 460 $ 272
Fair value of plan assets, Percentage 49.00% 33.00%
U.S. Government obligations    
Summary of plan assets investments    
Fair value of plan assets $ 199 $ 298
Fair value of plan assets, Percentage 21.00% 36.00%
U.S. Government agencies    
Summary of plan assets investments    
Fair value of plan assets $ 0 $ 22
Fair value of plan assets, Percentage 0.00% 3.00%
Defined Benefit Plan, Common Collective Trust [Member]    
Summary of plan assets investments    
Fair value of plan assets $ 105  
Fair value of plan assets, Percentage 11.00%  
Mutual funds-equities    
Summary of plan assets investments    
Fair value of plan assets $ 78 $ 64
Fair value of plan assets, Percentage 8.00% 8.00%
Common stock    
Summary of plan assets investments    
Fair value of plan assets $ 53 $ 98
Fair value of plan assets, Percentage 6.00% 12.00%
Preferred stock    
Summary of plan assets investments    
Fair value of plan assets $ 5 $ 5
Fair value of plan assets, Percentage 1.00% 1.00%
Exchange traded funds    
Summary of plan assets investments    
Fair value of plan assets $ 0 $ 45
Fair value of plan assets, Percentage 0.00% 5.00%
Limited Partnerships    
Summary of plan assets investments    
Fair value of plan assets $ 19 $ 16
Fair value of plan assets, Percentage 2.00% 1.00%