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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [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
 
2020
 
2019
 
2020
 
2019
Three months ended June 30
 
 
 
 
 
 
 
Service cost
$
35

 
$
30

 
$
2

 
$
1

Interest cost
22

 
25

 
2

 
3

Expected return on plan assets
(46
)
 
(41
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
19

 
10

 
—

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

 
2

 
—

 
—

Net periodic benefit cost
$
26

 
$
21

 
$
2

 
$
1

 
 
 
 
 
 
 
 
Six months ended June 30
 
 
 
 
 
 
 
Service cost
$
70

 
$
60

 
$
3

 
$
2

Interest cost
43

 
49

 
4

 
6

Expected return on plan assets
(90
)
 
(83
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
37

 
20

 
—

 
(2
)
Prior service credit
(10
)
 
(9
)
 
(3
)
 
(4
)
Special charges
1

 
2

 
—

 
1

Net periodic benefit cost 
$
51

 
$
39

 
$
4

 
$
3