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FINANCING ARRANGEMENTS - Senior Secured Credit Facilities 2020 Activities (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 26, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Long-term debt |  | $ 23,925,000,000 | $ 25,895,000,000
Term Loan B Facility Due June 2025 and November 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Repayment, outstanding debt | $ 303,000,000 |  |
Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of lines of credit |  | 471,000,000 | 806,000,000
Revolving credit facility | Term Loan B Facility Due June 2025 and November 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Repayment, outstanding debt | $ 250,000,000 |  |
Revolving credit facility | 2023 Revolving Credit Facility Due June 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | 0 | $ 0
Remaining availability |  | 1,121,000,000 |
Letter of Credit | 2023 Revolving Credit Facility Due June 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  | $ 104,000,000 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -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(a)(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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: 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 + Details
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