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Debt - Notes - Additional Information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Unsecured notes | $ 6,675,084,000 | $ 5,933,286,000
Repayments of unsecured debt | $ 450,000,000 |
Debt instrument, maturity date | Jan. 10, 2022 |
Notes Payable, Other Payables [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, maturity date | Aug. 01, 2047 |
Weighted average interest rate | 4.26% |
Notes Payable, Other Payables [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 2.50% |
Notes Payable, Other Payables [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 7.57% |
3.00% Notes [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from issuance of unsecured debt | $ 600,000,000.0 |
Debt instrument, interest rate, stated percentage | 3.00% |
Proceeds from debt, net of issuance costs | $ 597,500,000 |
2.50% Notes [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from issuance of unsecured debt | $ 600,000,000.0 |
Debt instrument, interest rate, stated percentage | 2.50% |
Proceeds from debt, net of issuance costs | $ 597,000,000.0 |
2.375% Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 2.375% |
Repayments of unsecured debt | $ 450,000.0 |
Debt instrument, basis spread on variable rate | 0.61% |
2.375% Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, description of variable rate basis | 90-Day LIBOR plus 0.61% |

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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 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/disclosureRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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