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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS
The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
Three months ended
September 30,		Nine months ended
September 30,
(in millions)2019201820192018
Pension benefits
Service cost$18  $23  $56  $70  
Interest cost47  45  137  136  
Expected return on plan assets(74) (78) (214) (235) 
Amortization of net losses and prior service costs15  24  44  72  
Net periodic pension benefit cost$6  $14  $23  $43  
OPEB
Interest cost$2  $2  $6  $6  
Amortization of net loss and prior service credit(7) (6) (21) (18) 
Net periodic OPEB cost$(5) $(4) $(15) $(12) 

As part of our continued effort to reduce pension plan obligations, we transferred approximately $2.4 billion of U.S. qualified pension plan liabilities to an insurance company through the purchase of a group annuity contract in October 2019. As a result of this transaction, we will recognize a non-cash pretax pension settlement charge of $755 million in the fourth quarter of 2019.