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FINANCING ARRANGEMENTS - Senior Secured Credit Facilities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 23,925,000,000 | $ 25,895,000,000 |
Series F Tranche B Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  |  | $ 3,521,000,000
Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  |  | 1,500,000,000
Amount outstanding |  |  | $ 250,000,000

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