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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension cost for the Company's defined-benefit pension plans
Net periodic pension cost for our defined-benefit pension plans was as follows, in millions: 
 
Three Months Ended September 30,
 
2016
 
2015
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
—

 
$
—

Interest cost
13

 
1

 
13

 
1

Expected return on plan assets
(15
)
 
—

 
(12
)
 
—

Amortization of net loss
5

 
1

 
5

 
1

Net periodic pension cost
$
4

 
$
2

 
$
6

 
$
2

 
Nine Months Ended September 30,
 
2016
 
2015
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
2

 
$
—

 
$
2

 
$
—

Interest cost
34

 
5

 
36

 
5

Expected return on plan assets
(34
)
 
—

 
(35
)
 
—

Amortization of net loss
12

 
2

 
14

 
2

Net periodic pension cost
$
14

 
$
7

 
$
17

 
$
7