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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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
 
2016
 
2015
 
2016
 
2015
Three months ended September 30:
 
 
 
 
 
 
 
Service cost
$
28

 
$
27

 
$
2

 
$
2

Interest cost
21

 
24

 
3

 
4

Expected return on plan assets
(35
)
 
(33
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(5
)
 
(4
)
 
(5
)
Net actuarial (gain) loss
13

 
16

 
(1
)
 
—

Special credits
(7
)
 
—

 
—

 
—

Net periodic benefit cost
$
15

 
$
29

 
$
—

 
$
1

 
 
 
 
 
 
 
 
Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
84

 
$
82

 
$
5

 
$
6

Interest cost
63

 
73

 
9

 
11

Expected return on plan assets
(104
)
 
(100
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(16
)
 
(12
)
 
(14
)
Net actuarial (gain) loss
37

 
47

 
(1
)
 
—

Special charges (credits)
(7
)
 
5

 
—

 
—

Net periodic benefit cost
$
58

 
$
91

 
$
1

 
$
3