Information Relating to the Consolidated Statement of Cash Flows - Summary of Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Distributions more (less) than income from equity affiliates includes the following:
Distributions from equity affiliates	$ 644	$ 420
(Income) loss from equity affiliates	(2,085)	(911)
Distributions more (less) than income from equity affiliates	(1,441)	(491)
Net decrease (increase) in operating working capital was composed of the following:
Decrease (increase) in accounts and notes receivable	(5,289)	(2,827)
Decrease (increase) in inventories	(222)	51
Decrease (increase) in prepaid expenses and other current assets	137	(102)
Increase (decrease) in accounts payable and accrued liabilities	3,768	1,599
Increase (decrease) in income and other taxes payable	669	377
Net decrease (increase) in operating working capital	(937)	(902)
Net cash provided by operating activities includes the following cash payments:
Interest on debt (net of capitalized interest)	47	70
Income taxes	1,071	629
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:
Proceeds and deposits related to asset sales	747	147
Returns of investment from equity affiliates	536	11
Proceeds and deposits related to asset sales and returns of investment	1,283	158
Net sales (purchases) of marketable securities consisted of the following gross amounts:
Marketable securities purchased	(2)	(1)
Marketable securities sold	2	1
Net sales (purchases) of marketable securities	0	0
Net repayment (borrowing) of loans by equity affiliates:
Borrowing of loans by equity affiliates	0	0
Repayment of loans by equity affiliates	12	25
Net repayment (borrowing) of loans by equity affiliates	12	25
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:
Proceeds from issuances of short-term obligations	0	2,872
Repayments of short-term obligations	0	(1,792)
Net borrowings (repayments) of short-term obligations with three months or less maturity	61	157
Net borrowings (repayments) of short-term obligations	61	1,237
Net sales (purchases) of treasury shares consists of the following gross and net amounts:
Shares issued for share-based compensation plans	4,641	273
Shares purchased under share repurchase and deferred compensation plans	(1,255)	(6)
Net sales (purchases) of treasury shares	3,386	267
Net contributions from (distributions to) noncontrolling interests consisted of the following gross amounts:
Distributions to noncontrolling interests	(5)	(11)
Contributions from noncontrolling interests	0	0
Net contributions from (distributions to) noncontrolling interests	(5)	(11)
Capital expenditures
Additions to properties, plant and equipment	1,732	1,631
Additions to investments	158	109
Current-year dry hole expenditures	70	4
Payments for other assets and liabilities, net	0	2
Capital expenditures	1,960	1,746
Expensed exploration expenditures	74	82
Assets acquired through finance lease obligations and other financing obligations	(2)	0
Payments for other assets and liabilities, net	0	(2)
Capital and exploratory expenditures, excluding equity affiliates	2,032	1,826
Company's share of expenditures by equity affiliates	725	678
Capital and exploratory expenditures, including equity affiliates	$ 2,757	$ 2,504