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

 
$
4

 
$
—

 
$
—

Interest cost
19

 
17

 
5

 
4

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

 
—

Amortization of actuarial losses
4

 
7

 
—

 
1

Amortization of prior service credit
—

 
—

 
(1
)
 
(3
)
Curtailment gain
—

 
—

 
—

 
(19
)
 
$
8

 
$
10

 
$
4

 
$
(17
)
 
Pension Benefits
 
OPEB
 
Six Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Service cost
$
8

 
$
8

 
$
—

 
$
—

Interest cost
38

 
35

 
8

 
8

Expected return on plan assets
(37
)
 
(35
)
 
—

 
—

Amortization of actuarial losses
6

 
13

 
1

 
3

Amortization of prior service credit
—

 
—

 
(2
)
 
(6
)
Curtailment gain
—

 
—

 
—

 
(19
)
 
$
15

 
$
21

 
$
7

 
$
(14
)