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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 06, 2017	Dec. 31, 2016	Nov. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Current portion of long-term debt:
Lease financing obligations	$ 1		$ 1
Debt issuance costs	(6)		(6)
Current portion of long-term debt	782		472
Non-current portion of long-term debt:
Debt issuance costs	(13)		(11)
Senior notes	1,317		975
Lease financing obligations	198		198
Total debt	$ 2,297		1,645
1.125% Convertible Notes
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.125%
1.125% Convertible Notes | Convertible Notes
Current portion of long-term debt:
Debt net of unamortized discount	$ 494		$ 477
Non-current portion of long-term debt:
Percentage of contractual interest rate on Notes	1.125%		1.125%			1.125%
5.375% Notes | Senior Notes
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 700		$ 700
Percentage of contractual interest rate on Notes	5.375%			5.375%
4.875% Notes | Senior Notes
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 330		0
Percentage of contractual interest rate on Notes	4.875%	4.875%
Credit Facility | Credit Facility
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 300		0
1.625% Convertible Notes | Convertible Notes
Current portion of long-term debt:
Debt net of unamortized discount	293		0
Non-current portion of long-term debt:
Debt net of unamortized debt discount	$ 0		$ 286
Percentage of contractual interest rate on Notes	1.625%				1.625%

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Contractual interest rate for funds borrowed, under the debt agreement.

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