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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Defined Benefit Plan [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
 
2017
 
2016
 
2017
 
2016
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
30

 
$
28

 
$
2

 
$
1

Interest cost
22

 
21

 
2

 
3

Expected return on plan assets
(38
)
 
(34
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
14

 
12

 
(1
)
 
—

Prior service credit
(5
)
 
(5
)
 
(4
)
 
(4
)
Net periodic benefit cost (credit)
$
23

 
$
22

 
$
(1
)
 
$
—

 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
61

 
$
56

 
$
3

 
$
3

Interest cost
43

 
42

 
5

 
6

Expected return on plan assets
(75
)
 
(69
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
27

 
24

 
(2
)
 
—

Prior service credit
(10
)
 
(10
)
 
(8
)
 
(8
)
Net periodic benefit cost (credit)
$
46

 
$
43

 
$
(2
)
 
$
1