Information Relating to the Consolidated Statement of Cash Flows - Summary of Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Distributions more (less) than income from equity affiliates included the following:
Distributions from equity affiliates	$ 3,423	$ 1,868
(Income) loss from equity affiliates	(3,908)	(4,141)
Distributions more (less) than income from equity affiliates	(485)	(2,273)
Net decrease (increase) in operating working capital was composed of the following:
Decrease (increase) in accounts and notes receivable	286	(890)
Decrease (increase) in inventories	(1,113)	(1,136)
Decrease (increase) in prepaid expenses and other current assets	96	(1,121)
Increase (decrease) in accounts payable and accrued liabilities	(121)	1,706
Increase (decrease) in income and other taxes payable	(1,320)	(2,740)
Net decrease (increase) in operating working capital	(2,172)	(4,181)
Net cash provided by operating activities included the following cash payments:
Interest on debt (net of capitalized interest)	326	292
Income taxes	6,586	8,189
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:
Proceeds and deposits related to asset sales	497	218
Returns of investment from equity affiliates	123	192
Proceeds and deposits related to asset sales and returns of investment	620	410
Net sales (purchases) of marketable securities consisted of the following gross amounts:
Marketable securities purchased	0	(289)
Marketable securities sold	45	373
Net sales (purchases) of marketable securities	45	84
Net maturities of (investments in) time deposits consisted of the following gross amounts:
Investments in time deposits	(4)	0
Maturities of time deposits	0	0
Net maturities of (investments in) time deposits	(4)	0
Net repayment (borrowing) of loans by equity affiliates consisted of the following gross amounts:
Borrowing of loans by equity affiliates	(211)	(296)
Repayment of loans by equity affiliates	54	54
Net repayment (borrowing) of loans by equity affiliates	(157)	(242)
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:
Proceeds from issuances of short-term debt obligations	829	0
Repayments of short-term debt obligations	0	0
Net borrowings (repayments) of short-term debt obligations with three months or less maturity	4,786	(33)
Net borrowings (repayments) of short-term obligations	5,615	(33)
Net contributions from (distributions to) noncontrolling interests consisted of the following gross amounts:
Distributions to noncontrolling interests	(210)	(54)
Contributions from noncontrolling interests	13	10
Net contributions from (distributions to) noncontrolling interests	(197)	(44)
Net sales (purchases) of treasury shares consisted of the following gross and net amounts:
Shares issued for share-based compensation plans	194	237
Shares purchased under share repurchase and deferred compensation plans	(10,729)	(11,518)
Net sales (purchases) of treasury shares	(10,535)	(11,281)
Capital expenditures
Additions to properties, plant and equipment	11,590	10,602
Additions to investments	392	636
Current-year dry hole expenditures	128	205
Payments for other assets and liabilities, net	0	25
Capital expenditures	$ 12,110	$ 11,468