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Debt - Notes - Additional Information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Unsecured notes | $ 5,143,248,000 |  | $ 4,848,079,000
Repayments of Notes Payable | $ 394,077,000 | $ 1,500,000,000 |
Notes Payable, Other Payables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date | Aug. 01, 2047 |  |
Weighted Average Interest Rate | 4.41% |  |
Notes Payable, Other Payables [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.375% |  |
Notes Payable, Other Payables [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.57% |  |
5.75 % Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 394,100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
3.25% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Public Notes, Face Value | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |
Proceeds from Debt, Net of Issuance Costs | $ 399,300,000 |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.32% |  |
4.00% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Public Notes, Face Value | $ 300,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |
Proceeds from Debt, Net of Issuance Costs | $ 293,200,000 |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.11% |  |

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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 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. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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(a)(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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