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Debt - Convertible Notes (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) d $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Net carrying amount of debt | $ 2,041,000,000 | $ 2,041,000,000 |  |
Loss on debt extinguishment |  | $ 14,000,000 | $ 0 | $ 0
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] |  |  |  |
Net carrying amount of debt | $ 550,000,000 | $ 550,000,000 |  |
Percentage of contractual interest rate | 1.125% | 1.125% |  |
Debt instrument conversion price per share (usd per share) | $ / shares | $ 40.77 | $ 40.77 |  |
Debt instrument conversion price, trigger price (usd per share) | $ / shares |  | $ 53.00 |  |
Senior note effective interest rate | 6.00% | 6.00% |  |
Senior notes amortization period |  | 2 years |  |
If-converted value in excess of principal on convertible debt |  | $ 406,000,000 | 182,000,000 |
Debt instrument, conversion ratio |  | 0.0245277 |  |
Convertible Debt | 1.625% Convertible Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net carrying amount of debt | $ 161,000,000 | $ 161,000,000 |  |
Percentage of contractual interest rate | 1.625% | 1.625% |  |
Debt instrument conversion price per share (usd per share) | $ / shares | $ 58.09 | $ 58.09 |  |
Debt instrument conversion price, trigger price (usd per share) | $ / shares |  | $ 75.51 |  |
Senior note effective interest rate | 5.00% | 5.00% |  |
If-converted value in excess of principal on convertible debt |  | $ 50,000,000 |  |
Debt instrument, conversion ratio |  | 0.0172157 |  |
Convertible debt, converted amount of instrument | $ 141,000,000 |  |  |
Convertible debt, shares converted in transaction (in shares) | shares | 2.6 |  |  |
Loss on debt extinguishment | $ 14,000,000 |  |  |
Increase of interest rate contingent on principal amount outstanding |  | 0.25% |  |
Minimum principal amount outstanding threshold for interest rate increase | 100,000,000 | $ 100,000,000 |  |
Debt redemption price, percentage of principal amount |  | 100.00% |  |
Term of debt instrument |  | 4 years |  |
Convertible debt discount amortization period |  | 7 months |  |
Convertible debt, carrying amount of equity component | $ 12,000,000 | $ 12,000,000 | $ 23,000,000 |
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 one | 1.625% 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% |  |
Convertible Debt | Redemption period, option two | 1.625% 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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