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Employee Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postemployment Benefit Obligations
The following table shows the change in the accumulated postretirement benefit obligation ("APBO") for the years ended December 31, 2018 and 2017:
 
(in millions)
 
2018
 
2017
APBO at beginning of period
 
$
275

 
$
256

Service cost
 
18

 
18

Interest cost
 
9

 
11

Benefits paid
 
(5
)
 
(8
)
Actuarial gain
 
(69
)
 
(2
)
  Plan amendments
 
4

 

APBO at end of period
 
$
232


$
275

Schedule of Amounts Recognized in Balance Sheet
The following table reconciles the funded status of the plans to the accrued postretirement benefit cost recognized in Other non-current liabilities on the Company’s Consolidated Balance Sheet at December 31, 2018 and 2017.
 
(in millions)
 
2018
 
2017
Funded status
 
$
(232
)
 
$
(275
)
Unrecognized net actuarial (gain) loss
 
(64
)
 
5

Unrecognized prior service cost
 
5

 
4

Accumulated other comprehensive income (loss)
 
59

 
(9
)
Cost recognized on Consolidated Balance Sheet
 
$
(232
)

$
(275
)
Schedule of Net Benefit Costs
The consolidated periodic postretirement benefit cost for the years ended December 31, 2018, 2017, and 2016, included the following:
 
(in millions)
 
2018
 
2017
 
2016
Service cost
 
$
18

 
$
18

 
$
13

Interest cost
 
9

 
11

 
9

Amortization of prior service cost
 
3

 
3

 
3

Net periodic postretirement benefit cost
 
$
30

 
$
32

 
$
25

Schedule of Assumptions Used
The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31, 2018, 2017, and 2016:
 
 
 
2018
 
2017
 
2016
Weighted-average discount rate
 
4.35
%
 
3.65
%
 
4.25
%
Assumed healthcare cost trend rate (a)
 
7.13
%
 
7.08
%
 
7.08
%
 
(a)
The assumed healthcare cost trend rate is assumed to be 7.13% for 2019, then decline gradually to 5.19% by 2027 and remain level thereafter.