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Debt - Unsecured Revolving Credit Facility (Details) - Unsecured debt - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |
Outstanding borrowings | $ 1,925,000,000 | $ 2,475,000,000
Unsecured Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Outstanding borrowings | 0 | 75,000,000
Remaining borrowing capacity | 600,000,000 | 525,000,000
Total borrowing capacity | $ 600,000,000 | $ 600,000,000
Debt instrument term | 1 year |
Unsecured Revolving Credit Facility | Minimum |  |
Line of Credit Facility [Line Items] |  |
Annual facility fee rate | 0.15% |
Unsecured Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 1.05% |
Unsecured Revolving Credit Facility | Maximum |  |
Line of Credit Facility [Line Items] |  |
Annual facility fee rate | 0.30% |
Unsecured Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 1.50% |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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