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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31:
 
 
 
 
 
 
 
Service cost
$
30

 
$
34

 
$
1

 
$
1

Interest cost
24

 
23

 
3

 
2

Expected return on plan assets
(42
)
 
(41
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
10

 
16

 
(1
)
 
—

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

 
2

 
1

 
—

Net periodic benefit cost 
$
18

 
$
29

 
$
2

 
$
—