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Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax liabilities    
Properties, plant and equipment $ 16,603 $ 17,251
Investments and other 5,617 5,372
Total deferred tax liabilities 22,220 22,623
Deferred tax assets    
Foreign tax credits (10,585) (9,840)
Asset retirement obligations/environmental reserves (4,721) (4,329)
Employee benefits (3,856) (3,454)
Deferred credits (1,056) (1,083)
Tax loss carryforwards (6,701) (5,262)
Other accrued liabilities (228) (441)
Inventory (633) (662)
Operating leases (1,234) (1,211)
Miscellaneous (3,685) (2,796)
Total deferred tax assets (32,699) (29,078)
Deferred tax assets valuation allowance 17,762 15,965
Total deferred taxes, net 7,283 9,510
Classification of deferred taxes    
Deferred charges and other assets (5,286) (4,178)
Noncurrent deferred income taxes 12,569 13,688
Total deferred income taxes, net $ 7,283 $ 9,510