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Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016:
 
(in millions)
 
2017
 
2016
APBO at beginning of period
 
$
256

 
$
201

Service cost
 
18

 
13

Interest cost
 
11

 
9

Benefits paid
 
(8
)
 
(6
)
Actuarial (gain)/loss
 
(2
)
 
38

  Plan amendments
 
—

 
1

APBO at end of period
 
$
275


$
256
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, 2017 and 2016.
 
(in millions)
 
2017
 
2016
Funded status
 
$
(275
)
 
$
(256
)
Unrecognized net actuarial loss
 
5

 
7

Unrecognized prior service cost
 
4

 
7

Accumulated other comprehensive loss
 
(9
)
 
(14
)
Cost recognized on Consolidated Balance Sheet
 
$
(275
)

$
(256
)
Schedule of Net Benefit Costs
The consolidated periodic postretirement benefit cost for the years ended December 31, 2017, 2016, and 2015, included the following:
 
(in millions)
 
2017
 
2016
 
2015
Service cost
 
$
18

 
$
13

 
$
11

Interest cost
 
11

 
9

 
7

Amortization of prior service cost
 
3

 
3

 
3

Recognized actuarial gain
 
—

 
—

 
(3
)
Net periodic postretirement benefit cost
 
$
32

 
$
25

 
$
18
Schedule of Assumptions Used
The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31, 2017, 2016, and 2015:
 
 
 
2017
 
2016
 
2015
Weighted-average discount rate
 
3.65
%
 
4.25
%
 
4.50
%
Assumed healthcare cost trend rate (1)
 
7.08
%
 
7.08
%
 
7.08
%
 
(1)
The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2018, then decline gradually to 5.19% by 2028 and remain level thereafter.
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
The assumed healthcare cost trend rates have a significant effect on the amounts reported for the consolidated postretirement plans. A one percent change in all healthcare cost trend rates used in measuring the APBO at December 31, 2017, would have the following effects:
 
(in millions)
 
1% increase
 
1% decrease
Increase (decrease) in total service and interest costs
 
$
5

 
$
(4
)
Increase (decrease) in the APBO
 
$
37

 
$
(32
)