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Financing Agreements (Tables)
 3 Months Ended
Mar. 31, 2016
Debt Disclosure [Abstract]  
Long-term Debt [Table Text Block]
Long-term debt at —
 
 
 
 
March 31, 2016
 
December 31, 2015
 
 
Interest
Rate
 
Principal
 
Unamortized Debt Issue Costs
 
Principal
 
Unamortized Debt Issue Costs
Senior Notes due February 15, 2021
 
6.750%
 
$
350

 
$
(4
)
 
$
350

 
$
(4
)
Senior Notes due September 15, 2021
 
5.375%
 
450

 
(6
)
 
450

 
(6
)
Senior Notes due September 15, 2023
 
6.000%
 
300

 
(4
)
 
300

 
(5
)
Senior Notes due December 15, 2024
 
5.500%
 
425

 
(6
)
 
425

 
(6
)
Other indebtedness
 
 
 
81

 
(1
)
 
66

 

Total
 
 
 
$
1,606

 
$
(21
)
 
$
1,591

 
$
(21
)
Margin Based on Remaining Borrowing Availability [Table Text Block]
Advances under our $500 revolving facility bear interest at a floating rate based on, at our option, the base rate or LIBOR (each as described in the revolving credit agreement) plus a margin based on the undrawn amounts available under the agreement as set forth below:
Remaining Borrowing Availability
 
Base Rate
 
LIBOR Rate
Greater than $350
 
0.50
%
 
1.50
%
Greater than $150 but less than or equal to $350
 
0.75
%
 
1.75
%
$150 or less
 
1.00
%
 
2.00
%