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Debt - Convertible Notes (Details) $ / shares in Units, shares in Millions	1 Months Ended			3 Months Ended			12 Months Ended
	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) d $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment							$ 22,000,000	$ 14,000,000	$ 0
Net carrying amount of debt				$ 1,282,000,000			$ 1,282,000,000
Convertible debt, converted amount of instrument				$ 16,000,000	$ 37,000,000	$ 21,000,000
1.125% Convertible Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate				1.125%			1.125%
1.625% Convertible Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate				1.625%			1.625%
Convertible Debt | 1.125% Convertible Notes
Debt Instrument [Line Items]
Debt instrument repayment of principal				$ 62,000,000	140,000,000	96,000,000
Repayments of debt				202,000,000	$ 483,000,000	$ 228,000,000
Loss on debt extinguishment							$ 12,000,000
Net carrying amount of debt				$ 252,000,000			$ 252,000,000
Percentage of contractual interest rate				1.125%			1.125%
Debt instrument conversion price per share (usd per share) | $ / shares				$ 40.77			$ 40.77
Senior note effective interest rate				6.00%			6.00%
Senior notes amortization period							1 year
If-converted value in excess of principal on convertible debt							$ 581,000,000	406,000,000
Debt instrument, conversion ratio							0.0245277
Convertible Debt | 1.625% Convertible Notes
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 10,000,000	$ 14,000,000
Net carrying amount of debt				$ 64,000,000			$ 64,000,000
Percentage of contractual interest rate				1.625%			1.625%
Debt instrument conversion price per share (usd per share) | $ / shares				$ 58.09			$ 58.09
Equity component			12,000,000					$ 12,000,000
Debt instrument, conversion ratio							0.0172157
Convertible debt, converted amount of instrument	$ 64,000,000	$ 97,000,000	$ 141,000,000
Convertible debt, shares converted in transaction (in shares) | shares		1.8	2.6		0.6
Convertible Debt | Redemption period, option one | 1.125% Convertible Notes
Debt Instrument [Line Items]
Debt convertible threshold trading days | d							20
Debt convertible threshold consecutive trading days | d							30
Debt convertible threshold percentage of stock price trigger							130.00%
Convertible Debt | Redemption period, option two | 1.125% Convertible Notes
Debt Instrument [Line Items]
Debt convertible threshold trading days | d							5
Debt convertible threshold consecutive trading days | d							5
Debt convertible maximum threshold percentage of stock price							98.00%

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Debt Instrument, Convertible, Maximum Threshold Percentage of Stock Price Trigger

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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