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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2013
Class of Stock [Line Items]
Number of warrants issued (in shares)							13,490,236
Warrant, strike price per share (in dollars per share)							$ 53.8475
Cash paid for partial termination of 1.125% Warrants					$ 419	$ 0
Share-based compensation		$ 7		$ 3	20	38
Unrecognized compensation expense		41			$ 41
Unrecognized compensation forfeiture rate					12.10%
Stock options granted (in shares)					0
Stock options exercised (in shares)					0
Restricted Stock Awards
Class of Stock [Line Items]
Weighted average period for recognition					2 years 10 months
Performance Stock Awards
Class of Stock [Line Items]
Weighted average period for recognition					5 months
Performance Stock Units
Class of Stock [Line Items]
Weighted average period for recognition					2 years 4 months
Employee Stock Option
Class of Stock [Line Items]
Unrecognized compensation expense		$ 11			$ 11
Weighted average period for recognition					2 years
Common Stock
Class of Stock [Line Items]
Number of common stock issued (in shares)					281,000
1.625% Notes (2) | Convertible Notes
Class of Stock [Line Items]
Debt conversion (in shares)	1,800,000	600,000
Cash Convertible Senior Notes Due 2020, Warrants
Class of Stock [Line Items]
Stated percentage of warrants		1.125%			1.125%
Warrants outstanding (in shares)		7,700,000			7,700,000
Cash paid for partial termination of 1.125% Warrants		$ 306	$ 113		$ 113
Number of warrants terminated (in shares)		3,400,000			2,400,000
Restructuring and separation costs
Class of Stock [Line Items]
Share-based compensation						$ 23

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