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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Costs
Components of net periodic benefit cost for the three months ended March 31, 2015 and 2014 are as follows:
 
Pension Benefits
 
OPEB
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Service cost
$
5

 
$
4

 
$
—

 
$
—

Interest cost
16

 
19

 
3

 
3

Expected return on plan assets
(17
)
 
(18
)
 
—

 
—

Amortization of actuarial losses
7

 
2

 
2

 
1

Amortization of prior service credit
—

 
—

 
(1
)
 
(1
)
 
$
11

 
$
7

 
$
4

 
$
3