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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost (Credit)
The components of net periodic benefit cost for our retirement plans and postretirement plans for the three months ended March 31 are as follows: 
(in millions)

2019
 
2018
Service cost
$
1

 
$
1

Interest cost
19

 
18

Expected return on assets
(31
)
 
(32
)
Amortization of prior service credit / actuarial loss
2

 
4

Net periodic benefit cost
(9
)
 
(9
)
Settlement charge 1
113

 
—

Net benefit cost
$
104

 
$
(9
)
 
1 The Company purchased a group annuity contract under which an insurance company assumed a portion of the Company's obligation to pay pension benefits to the plan's beneficiaries. The purchase of this group annuity contract was funded by pension plan assets. The non-cash pre-tax settlement charge reflects the accelerated recognition of a portion of unamortized actuarial losses in the plan.