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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Retirement Plans
EMPLOYEE RETIREMENT PLANS
 
Net periodic pension cost for our defined-benefit pension plans was as follows, in millions: 
 
Three Months Ended September 30,
 
2017
 
2016
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
1

 
$
—

Interest cost
11

 
2

 
13

 
1

Expected return on plan assets
(12
)
 
—

 
(15
)
 
—

Amortization of net loss
5

 
1

 
5

 
1

Net periodic pension cost
$
5

 
$
3

 
$
4

 
$
2

 
Nine Months Ended September 30,
 
2017
 
2016
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
2

 
$
—

 
$
2

 
$
—

Interest cost
36

 
5

 
34

 
5

Expected return on plan assets
(36
)
 
—

 
(34
)
 
—

Amortization of net loss
15

 
2

 
12

 
2

Net periodic pension cost
$
17

 
$
7

 
$
14

 
$
7


    
As of January 1, 2010, substantially all of our domestic and foreign qualified and domestic non-qualified defined benefit pension plans were frozen to future benefit accruals.