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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
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
 
2019
 
2018
 
2019
 
2018
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
30

 
$
33

 
$
1

 
$
2

Interest cost
25

 
23

 
3

 
3

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

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
10

 
17

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

 
3

 
—

 
—

Net periodic benefit cost
$
21

 
$
31

 
$
1

 
$
1

 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
60

 
$
67

 
$
2

 
$
3

Interest cost
49

 
46

 
6

 
5

Expected return on plan assets
(83
)
 
(82
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
20

 
33

 
(2
)
 
(1
)
Prior service credit
(9
)
 
(9
)
 
(4
)
 
(6
)
Special charges
2

 
5

 
1

 
—

Net periodic benefit cost 
$
39

 
$
60

 
$
3

 
$
1