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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
2016
 
2015
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
—

 
$
—

 
$
1

 
$
—

Interest cost
10

 
3

 
11

 
3

Expected return on plan assets
(9
)
 
—

 
(12
)
 
—

Amortization of net loss
3

 
—

 
5

 
—

Net periodic pension cost
$
4

 
$
3

 
$
5

 
$
3

 
Six Months Ended June 30,
 
2016
 
2015
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
2

 
$
—

Interest cost
21

 
4

 
23

 
4

Expected return on plan assets
(19
)
 
—

 
(23
)
 
—

Amortization of net loss
7

 
1

 
9

 
1

Net periodic pension cost
$
10

 
$
5

 
$
11

 
$
5