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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Costs
Components of net periodic benefit cost for the three and nine months ended September 30, 2014 and 2013 are as follows:
 
Pension Benefits
 
OPEB
 
Three Months Ended September 30,
 
Three Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Service cost
$
4

 
$
4

 
$
—

 
$
—

Interest cost
19

 
17

 
4

 
4

Expected return on plan assets
(19
)
 
(18
)
 
—

 
—

Amortization of actuarial losses
2

 
7

 
1

 
1

Amortization of prior service credit
—

 
1

 
(2
)
 
(2
)
Curtailment gain
—

 
—

 
—

 
(19
)
 
$
6

 
$
11

 
$
3

 
$
(16
)
 
Pension Benefits
 
OPEB
 
Nine Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Service cost
$
12

 
$
12

 
$
—

 
$
—

Interest cost
57

 
52

 
12

 
12

Expected return on plan assets
(56
)
 
(53
)
 
—

 
—

Amortization of actuarial losses
8

 
20

 
2

 
4

Amortization of prior service credit
—

 
1

 
(4
)
 
(8
)
Curtailment gain
—

 
—

 
—

 
(38
)
 
$
21

 
$
32

 
$
10

 
$
(30
)