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Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax liabilities    
Properties, plant and equipment $ 17,169 $ 16,603
Investments and other 4,105 5,617
Total deferred tax liabilities 21,274 22,220
Deferred tax assets    
Foreign tax credits (11,718) (10,585)
Asset retirement obligations/environmental reserves (4,553) (4,721)
Employee benefits (3,037) (3,856)
Deferred credits (996) (1,056)
Tax loss carryforwards (4,175) (6,701)
Other accrued liabilities (239) (228)
Inventory (289) (633)
Operating leases (1,255) (1,234)
Miscellaneous (3,657) (3,685)
Total deferred tax assets (29,919) (32,699)
Deferred tax assets valuation allowance 17,651 17,762
Total deferred taxes, net 9,006 7,283
Classification of deferred taxes    
Deferred charges and other assets (5,659) (5,286)
Noncurrent deferred income taxes 14,665 12,569
Total deferred income taxes, net $ 9,006 $ 7,283