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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30:
 
 
 
 
 
 
 
Service cost
$
33

 
$
31

 
$
2

 
$
1

Interest cost
22

 
21

 
2

 
3

Expected return on plan assets
(40
)
 
(37
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
16

 
13

 
(1
)
 
—

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

 
3

 
—

 
—

Net periodic benefit cost
$
28

 
$
26

 
$
1

 
$
—

 
 
 
 
 
 
 
 
Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
100

 
$
92

 
$
5

 
$
4

Interest cost
68

 
64

 
7

 
8

Expected return on plan assets
(122
)
 
(112
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
49

 
40

 
(2
)
 
(2
)
Prior service credit
(14
)
 
(15
)
 
(8
)
 
(12
)
Special charges
7

 
3

 
—

 
—

Net periodic benefit cost (credit)
$
88

 
$
72

 
$
2

 
$
(2
)