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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Periodic Benefit Costs
Components of net periodic benefit cost (gain) for the three and six months ended June 30, 2013 and 2012 are as follows:
 
Pension Benefits
 
OPEB
 
Three Months Ended June 30,
 
Three Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(in millions)
Service cost
$
4

 
$
7

 
$
—

 
$
—

Interest cost
17

 
20

 
4

 
4

Expected return on plan assets
(18
)
 
(16
)
 
—

 
—

Amortization of actuarial losses
7

 
9

 
1

 
—

Amortization of prior service credit
—

 
—

 
(3
)
 
(4
)
Settlement gain
—

 
—

 
—

 
—

Curtailment gain
—

 
—

 
(19
)
 
—

 
$
10

 
$
20

 
$
(17
)
 
$
—

 
Pension Benefits
 
OPEB
 
Six Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(in millions)
Service cost
$
8

 
$
14

 
$
—

 
$
—

Interest cost
35

 
41

 
8

 
8

Expected return on plan assets
(35
)
 
(32
)
 
—

 
—

Amortization of actuarial losses
13

 
19

 
3

 
—

Amortization of prior service credit
—

 
—

 
(6
)
 
(8
)
Settlement gain
—

 
(1
)
 
—

 
—

Curtailment gain
—

 
—

 
(19
)
 
—

 
$
21

 
$
41

 
$
(14
)
 
$
—