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Debt - Senior Unsecured Notes (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2017 | May 01, 2017 | Nov. 30, 2016 | Sep. 15, 2016 | Feb. 01, 2016 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  | $ 7,834,317,000 |  |
Loss on debt extinguishments |  |  |  |  |  |  | $ (46,000,000) | (54,227,000) | $ (46,020,000) | $ 0
Senior unsecured notes |  |  |  |  |  |  | 7,133,538,000 | 6,396,451,000 | 7,133,538,000 |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  | $ 6,450,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |
Senior unsecured notes |  |  |  |  |  |  | $ 0 | $ 0 | 0 |
Senior Unsecured Debt 5.625% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  | $ 250,000,000 |  |  |  | $ 500,000,000 |  |  |  |
Interest rate (as a percent) |  | 5.625% |  |  |  | 5.375% |  |  |  |
Loss on debt extinguishments |  |  |  |  |  | $ (54,000,000) |  | $ (54,000,000) | $ (46,000,000) |
Senior Unsecured Debt 5.375% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes | $ 500,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 5.375% |  |  |  |  |  |  |  |  |
Senior Unsecured Debt 3.75 % |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  |  | $ 500,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.75% |  |  |  |  |
Senior Unsecured Debt 6.30% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  | $ 400,000,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 6.30% |  |  |  |  |  |
Senior Unsecured Debt 6.000% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  | $ 500,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 6.00% |  |  |  |  |  |  |
Senior Unsecured Debt 6.700% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  | $ 600,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 6.70% |  |  |  |  |  |  |

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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 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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