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Debt (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Long term debt
The following table summarizes our outstanding debt obligations and their classification in the accompanying consolidated balance sheets (in millions):
 
March 31,
2017
 
December 31,
2016
Current portion of long-term debt:
 
 
 
1.125% Convertible Notes, net of unamortized discount
$
—

 
$
477

Lease financing obligations
1

 
1

Debt issuance costs
—

 
(6
)
 
1

 
472

Senior notes:
 
 
 
5.375% Notes
700

 
700

1.125% Convertible Notes, net of unamortized discount
482

 
—

1.625% Convertible Notes, net of unamortized premium and discount
289

 
286

Debt issuance costs
(16
)
 
(11
)
 
1,455

 
975

Lease financing obligations
198

 
198

 
$
1,654

 
$
1,645