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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Nov. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Current portion of long-term debt:
Debt issuance costs	$ 0	$ (6)
Current portion of long-term debt	1	472
Senior notes:
Debt issuance costs	(16)	(11)
Senior notes	1,455	975
Lease financing obligations	198	198
Total debt	1,654	1,645
5.375% Notes | Senior Notes
Senior notes:
Debt net of unamortized debt discount	$ 700	700
Percentage of contractual interest rate on Notes	5.375%		5.375%
1.125% Convertible Notes
Senior notes:
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	$ 0	477
Senior notes:
Debt net of unamortized debt discount	$ 482	0
Percentage of contractual interest rate on Notes	1.125%				1.125%
Other
Current portion of long-term debt:
Lease financing obligations	$ 1	1
1.625% Convertible Notes | Convertible Notes
Senior notes:
Debt net of unamortized debt discount	$ 289	$ 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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