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Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [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, 2014 and 2013:
 
(in millions)
 
2014
 
2013
APBO at beginning of period
 
$
138

 
$
148

Service cost
 
10

 
30

Interest cost
 
7

 
4

Benefits paid
 
(4
)
 
(3
)
Actuarial (gain)/loss
 
21

 
(41
)
  Settlements
 
$
(3
)
 
$
—

APBO at end of period
 
$
169


$
138
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, 2014 and 2013.
 
(in millions)
 
2014
 
2013
Funded status
 
$
(169
)
 
$
(138
)
Unrecognized net actuarial gain
 
(53
)
 
(80
)
Unrecognized prior service cost
 
12

 
15

Accumulated other comprehensive income
 
41

 
65

Cost recognized on Consolidated Balance Sheet
 
$
(169
)

$
(138
)
Schedule of Net Benefit Costs
The consolidated periodic postretirement benefit cost for the years ended December 31, 2014, 2013, and 2012, included the following:
 
(in millions)
 
2014
 
2013
 
2012
Service cost
 
$
10

 
$
30

 
$
20

Interest cost
 
7

 
4

 
4

Amortization of prior service cost
 
3

 
3

 
—

Recognized actuarial gain
 
(4
)
 
(4
)
 
(5
)
Settlements
 
$
(1
)
 
$
—

 
$
—

Net periodic postretirement benefit cost
 
$
15

 
$
33

 
$
19
Schedule of Assumptions Used
The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31, 2014, 2013, and 2012:
 
 
 
2014
 
2013
 
2012
Weighted-average discount rate
 
4.10
%
 
5.05
%
 
2.90
%
Assumed healthcare cost trend rate (1)
 
6.88
%
 
7.50
%
 
8.00
%
 
(1)
The assumed healthcare cost trend rate is assumed to remain at 6.88% for 2015, then decline gradually to 5.00% by 2025 and remain level thereafter.
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
(in millions)
 
1% increase
 
1% decrease
Increase (decrease) in total service and interest costs
 
$
3

 
$
(2
)
Increase (decrease) in the APBO
 
$
24

 
$
(20
)