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Employee Retirement Plans
 3 Months Ended
Mar. 31, 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 March 31,
 
2017
 
2016
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
1

 
$
—

Interest cost
12

 
1

 
11

 
1

Expected return on plan assets
(12
)
 
—

 
(10
)
 
—

Amortization of net loss
5

 
1

 
4

 
1

Net periodic pension cost
$
6

 
$
2

 
$
6

 
$
2


We froze all future benefit accruals under substantially all of our domestic and foreign qualified and domestic non-qualified defined benefit pension plans several years ago.