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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Defined Benefit Plan [Abstract]  
Periodic benefit cost (credit) related to our defined benefit plans, net
The components of net periodic benefit cost (credit) related to our defined benefit plans were as follows (in millions):
 
Pension Plans
 
Other Postretirement
Benefit Plans
 
2018
 
2017
 
2018
 
2017
Three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
34

 
$
31

 
$
1

 
$
1

Interest cost
23

 
21

 
2

 
3

Expected return on plan assets
(41
)
 
(37
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
16

 
13

 
—

 
(1
)
Prior service credit
(5
)
 
(5
)
 
(3
)
 
(4
)
Special charges
2

 
—

 
—

 
—

Net periodic benefit cost (credit)
$
29

 
$
23

 
$
—

 
$
(1
)