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Pension Plan and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Pension Plan and Other Postretirement Benefits PENSION PLAN AND OTHER POSTRETIREMENT BENEFITS
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  
The Company recognized a $5 million non-cash settlement loss related to $19 million of lump sum payments from the pension plan for the nine months ended September 30, 2019 for employees who were terminated primarily as a result of the Fayetteville Shale sale.
The Company’s other postretirement benefit plan had a net periodic benefit cost of less than $1 million for the three months ended September 30, 2019 and 2018 and a net periodic benefit cost of $1 million and $2 million for the nine months ended September 30, 2019 and 2018, respectively.
As of September 30, 2019, the Company has contributed $12 million to the pension and other postretirement benefit plans and does not expect to further contribute to its pension plan during the remainder of 2019.  The Company recognized liabilities of $26 million and $13 million related to its pension and other postretirement benefits, respectively, as of September 30, 2019, compared to liabilities of $34 million and $13 million as of December 31, 2018, respectively.
The Company maintains a non-qualified deferred compensation supplemental retirement savings plan (“Non-Qualified Plan”) for certain key employees who may elect to defer and contribute a portion of their compensation, as permitted by the Non-Qualified Plan.  Shares of the Company’s common stock purchased under the terms of the Non-Qualified Plan are included in treasury stock and totaled 5,115 shares and 10,653 shares at September 30, 2019 and December 31, 2018, respectively.