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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Periodic benefit cost related to our defined benefit plans, net
The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
 
Pension Plans
 
Other Postretirement
Benefit Plans
 
2016
 
2015
 
2016
 
2015
Three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
28

 
$
27

 
$
2

 
$
2

Interest cost
21

 
24

 
3

 
4

Expected return on plan assets
(35
)
 
(33
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(5
)
 
(4
)
 
(5
)
Net actuarial loss
12

 
16

 
—

 
—

Net periodic benefit cost
$
21

 
$
29

 
$
1

 
$
1