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Debt (Tables)
 6 Months Ended
Jun. 30, 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):
 
June 30,
2017
 
December 31,
2016
Current portion of long-term debt:
 
 
 
1.125% Convertible Notes, net of unamortized discount
$
488

 
$
477

1.625% Convertible Notes, net of unamortized premium and discount
291

 
—

Lease financing obligations
1

 
1

Debt issuance costs
(7
)
 
(6
)
 
773

 
472

Non-current portion of long-term debt, reported as “Senior notes”:
 
 
 
5.375% Notes
700

 
700

4.875% Notes
330

 
—

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

 
286

Debt issuance costs
(13
)
 
(11
)
 
1,017

 
975

Lease financing obligations
198

 
198

 
$
1,988

 
$
1,645