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INCOME TAXES - NARRATIVE (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Worldwide effective tax rate | 14.00% | 243.00% | 26.00% |
Total deferred tax assets, after valuation allowances | $ 4,345,000,000 | $ 3,703,000,000 |  |
Total deferred tax liabilities | 11,402,000,000 | 13,364,000,000 |  |
Foreign tax credit carryforwards | 4,465,000,000 | 4,379,000,000 |  |
General business credit carryforwards | 607,000,000 | 443,000,000 |  |
Interest expense carryforward | 668,000,000 | 492,000,000 |  |
Deferred foreign tax liability due to reversal of indefinite re-investment assertion | 930,000,000 |  |  |
Additional deferred tax liability amount required | 214,000,000 |  |  |
Unrecognized tax benefits | 2,045,000,000 | 2,173,000,000 | $ 0 | $ 22,000,000
Potential benefit | 2,000,000,000.0 |  |  |
Potential benefit, if recognized, would affect the effective tax rate on income | 1,600,000,000 |  |  |
Benefits related to tax positions which ultimate deductibility is highly certain | 84,000,000 |  |  |
Interest related to liabilities for unrecognized tax benefits | 67,000,000 |  |  |
Cumulative accrued interest related to liabilities for unrecognized tax benefits | 263,000,000 |  |  |
Interest and penalties associated with liabilities for unrecognized tax benefits |  | 0 |  |
Low end of range |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Possible decrease to unrecognized tax benefit due to settlements with taxing authorities | 70,000,000 |  |  |
High end of range |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Possible decrease to unrecognized tax benefit due to settlements with taxing authorities | 80,000,000 |  |  |
Other current assets |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax receivables | 110,000,000 | 86,000,000 |  |
Long-term receivables and other assets, net |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Federal alternative minimum tax non-current receivables | 24,000,000 | $ 36,000,000 |  |
Federal |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards | 631,000,000 |  |  |
Interest expense carryforward | 569,000,000 |  |  |
Foreign |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforward, valuation allowance | 4,400,000,000 |  |  |
Operating loss carryforwards | 850,000,000 |  |  |
Operating loss carryforward, valuation allowance | 795,000,000 |  |  |
Valuation allowance on other deferred tax assets | 145,000,000 |  |  |
State |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax credit carryforwards | 39,000,000 |  |  |
Tax credit carryforward, valuation allowance | 30,000,000 |  |  |
Operating loss carryforwards | 316,000,000 |  |  |
Operating loss carryforward, valuation allowance | 251,000,000 |  |  |
Interest expense carryforward | 99,000,000 |  |  |
Valuation allowance on interest expense carryforward | $ 64,000,000 |  |  |

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