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Employee Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$

 
$

 
$

 
$

Interest cost
13

 
2

 
10

 
3

Expected return on plan assets
(12
)
 

 
(9
)
 

Amortization of net loss
5

 

 
3

 

Net periodic pension cost
$
6

 
$
2

 
$
4

 
$
3

 
Six Months Ended June 30,
 
2017
 
2016
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$

 
$
1

 
$

Interest cost
25

 
3

 
21

 
4

Expected return on plan assets
(24
)
 

 
(19
)
 

Amortization of net loss
10

 
1

 
7

 
1

Net periodic pension cost
$
12

 
$
4

 
$
10

 
$
5