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Pension Plan and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefit Costs
The Company maintains defined pension and other postretirement benefit plans, which cover substantially all of the Company’s employees.  Net periodic pension costs include the following components for the three and nine months ended September 30, 2019 and 2018:
Consolidated Statements of
Operations Classification of
Net Periodic Benefit Cost		For the three months ended September 30,For the nine months ended September 30,
(in millions)2019201820192018
Service costGeneral and administrative expenses$1  $2  $5  $8  
Interest costOther Income (Loss), Net2  1  4  4  
Expected return on plan assetsOther Income (Loss), Net(1) (2) (4) (6) 
Amortization of prior service costOther Income (Loss), Net—  —  —  —  
Amortization of net lossOther Income (Loss), Net—  1  1  1  
Settlement lossOther Income (Loss), Net1  —  5  —  
Net periodic benefit cost $3  $2  $11  $7