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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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
 
2017
 
2016
 
2017
 
2016
Three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
31

 
$
28

 
$
1

 
$
2

Interest cost
21

 
21

 
3

 
3

Expected return on plan assets
(37
)
 
(35
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial (gain) loss
13

 
12

 
(1
)
 
—

Prior service credit
(5
)
 
(5
)
 
(4
)
 
(4
)
Net periodic benefit cost
$
23

 
$
21

 
$
(1
)
 
$
1