Restructuring and Reorganization Costs (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 859
Restructuring charges, after tax	670
Restructuring Reserve [Roll Forward]
Balance at January 1, 2020	7
Accruals/Adjustments	859
Payments	(396)
Balance at December 31, 2020	470
Operating Segments \| United States \| Upstream
Restructuring Cost and Reserve [Line Items]
Restructuring charges	127
Restructuring charges, after tax	97
Operating Segments \| United States \| Downstream
Restructuring Cost and Reserve [Line Items]
Restructuring charges	112
Restructuring charges, after tax	85
Operating Segments \| International \| Upstream
Restructuring Cost and Reserve [Line Items]
Restructuring charges	288
Restructuring charges, after tax	228
Operating Segments \| International \| Downstream
Restructuring Cost and Reserve [Line Items]
Restructuring charges	69
Restructuring charges, after tax	54
Segment Reconciling Items
Restructuring Cost and Reserve [Line Items]
Restructuring charges	263
Restructuring charges, after tax	206
Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	690
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 169

Restructuring Charges, Net

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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