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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30:
 
 
 
 
 
 
 
Service cost
$
33

 
$
30

 
$
2

 
$
2

Interest cost
23

 
22

 
3

 
2

Expected return on plan assets
(41
)
 
(38
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
17

 
14

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

 
—

 
—

 
—

Net periodic benefit cost (credit)
$
31

 
$
23

 
$
1

 
$
(1
)
 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
67

 
$
61

 
$
3

 
$
3

Interest cost
46

 
43

 
5

 
5

Expected return on plan assets
(82
)
 
(75
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
33

 
27

 
(1
)
 
(2
)
Prior service credit
(9
)
 
(10
)
 
(6
)
 
(8
)
Special charges
5

 
—

 
—

 
—

Net periodic benefit cost (credit)
$
60

 
$
46

 
$
1

 
$
(2
)