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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30:
 
 
 
 
 
 
 
Service cost
$
29

 
$
33

 
$
1

 
$
2

Interest cost
25

 
22

 
2

 
2

Expected return on plan assets
(41
)
 
(40
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
10

 
16

 
—

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

 
2

 
—

 
—

Net periodic benefit cost
$
18

 
$
28

 
$
1

 
$
1

 
 
 
 
 
 
 
 
Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
89

 
$
100

 
$
3

 
$
5

Interest cost
74

 
68

 
8

 
7

Expected return on plan assets
(124
)
 
(122
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
30

 
49

 
(2
)
 
(2
)
Prior service credit
(14
)
 
(14
)
 
(6
)
 
(8
)
Special charges
2

 
7

 
1

 
—

Net periodic benefit cost 
$
57

 
$
88

 
$
4

 
$
2