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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on a Non-Recurring Basis, Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) product | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets reclassified, held and used |  | $ 33,863 |  | $ 31,199 |
Non-recurring basis |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Non-current assets held for sale |  | 39 |  | 245 |
Level 3 | Non-recurring basis |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Non-current assets held for sale |  | 39 |  | $ 245 |
Held For Sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of long-lived assets |  |  | $ 5 |  |
Held For Sale | Certain Products For Disposal, September 2019 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of long-lived assets | $ 8 | $ 8 |  |  |
Held For Sale | Certain Products For Disposal, September 2019 | Restatement Adjustment |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets reclassified, held for sale |  |  |  |  | $ 39
Assets reclassified, held and used |  |  |  |  | $ 39
Diversified Products | Held For Sale | Certain Products For Disposal, September 2019 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Number of products for disposal | product |  | 1 |  |  |

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