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INCOME TAXES - COMPONENTS OF DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities |  |
Property, plant and equipment differences | $ (12,375) | $ (2,089)
Equity investments, partnerships and foreign subsidiaries | (989) | (161)
Gross long-term deferred tax liabilities | (13,364) | (2,250)
Deferred tax assets |  |
Environmental reserves | 261 | 195
Postretirement benefit accruals | 441 | 176
Deferred compensation and benefits | 266 | 170
Asset retirement obligations | 906 | 280
Foreign tax credit carryforwards | 4,379 | 2,356
General business credit carryforwards | 443 | 429
Net operating loss carryforward | 692 | 29
Interest expense carryforward | 492 | 0
All other | 782 | 111
Gross long-term deferred tax assets | 8,662 | 3,746
Valuation allowance | (4,959) | (2,403)
Net long-term deferred tax assets | 3,703 | 1,343
Less: Foreign deferred tax asset in long-term receivables and other assets, net | (56) | 0
Total deferred income taxes, net | $ (9,717) | $ (907)

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