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DEBT (Senior Unsecured Revolving Credit Facility) (Narrative) (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Oct. 22, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Remaining borrowing capacity | $ 1,300,000,000 |  |  |  |  |
Senior unsecured revolving credit facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity | 750,000,000 |  |  |  |  |
Amount outstanding | 0 | $ 0 |  |  |  |
Remaining borrowing capacity | $ 750,000,000 |  |  |  |  |
Senior unsecured revolving credit facility [Member] | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio requirement | 650.00% |  |  |  |  |
Senior unsecured revolving credit facility [Member] | Maximum | Forecast |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Leverage ratio requirement |  |  | 350.00% | 450.00% | 625.00% |
Senior unsecured revolving credit facility [Member] | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in excess of LIBOR | 1.125% | 1.125% |  |  |  |
Senior unsecured revolving credit facility [Member] | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity | $ 150,000,000 |  |  |  |  |
Secured Receivables Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | $ 600,000,000
Remaining borrowing capacity | $ 530,000,000 |  |  |  |  |
Secured Receivables Credit Facility | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | $ 100,000,000

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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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