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DEBT - Senior Notes and Debt Redemption (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Feb. 29, 2020 | Mar. 31, 2019 | Nov. 30, 2014
Debt Instrument |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  | $ 50,000,000 | $ 275,000,000 |  |  |  |
Debt outstanding |  |  |  | $ 3,490,000,000 |  | $ 3,500,000,000 |  |  |
Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Redemption price |  |  |  | 101.00% |  |  |  |  |
Fair value disclosure |  |  |  | $ 4,140,000,000 |  | $ 4,010,000,000.00 |  |  |
Senior notes | 2020 Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 750,000,000.0 |  |
Senior notes | 2019 Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  | $ 1,200,000,000 |
Senior notes | 2014 Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  | $ 2,500,000,000
Repayment of debt | $ 500,000,000.0 | $ 250,000,000.0 | $ 250,000,000.0 |  |  |  |  |  |
Debt outstanding |  |  |  | $ 1,500,000,000 |  |  |  |  |

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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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