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Subsequent Events (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 25, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Subsequent events |  |  |
Proceeds from issuance of debt |  | $ 1,319 | $ 403
7.25% Senior Notes due November 2025 | Subsequent Event |  |  |
Subsequent events |  |  |
Debt instrument face value | $ 750 |  |
Debt instrument interest rate stated percentage | 7.25% |  |
Proceeds from issuance of debt | $ 735 |  |
Redemption price of debt instrument (as a percent) | 100.00% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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