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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Net Periodic Benefit Cost (Credit)
The components of net periodic benefit cost are as follows.

Net periodic benefit cost (credit)
 
Quarter ended
 
 
 
March 31, 2015
 
March 31, 2014
(in millions)
Domestic pension benefits

Foreign pension benefits

Health care benefits

 
Domestic pension benefits

Foreign pension benefits

Health care benefits

Service cost
$
15

$
8

$
1

 
$
14

$
9

$
1

Interest cost
43

10

2

 
45

11

3

Expected return on assets
(83
)
(13
)
(2
)
 
(79
)
(15
)
(2
)
Curtailment (gain)/loss
(30
)
—

—

 
—

—

—

Other
31

6

—

 
28

4

—

Net periodic benefit cost (credit)
$
(24
)
$
11

$
1

 
$
8

$
9

$
2