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EMPLOYEE BENEFITS - Changes in the Fair Value of Pension Plan Assets, Projected Benefit Obligation, Funded Status, and Accumulated Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 12, 2018
Dec. 31, 2018
Dec. 31, 2017
Qualified Plan      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets as of January 1   $ 1,139 $ 1,015
Actual return on plan assets   (81) 185
Employer contributions $ 50 50 0
Benefits and administrative expenses paid   (58) (61)
Fair value of plan assets as of December 31   1,050 1,139
Projected benefit obligation   972 1,089
Pension asset (obligation)   78 50
Accumulated benefit obligation   972 1,089
Non-Qualified Plan      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets as of January 1   0 0
Actual return on plan assets   0 0
Employer contributions   8 8
Benefits and administrative expenses paid   (8) (8)
Fair value of plan assets as of December 31   0 0
Projected benefit obligation   95 106
Pension asset (obligation)   (95) (106)
Accumulated benefit obligation   $ 95 $ 106