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Information Relating to the Consolidated Statement of Cash Flows - Summary of Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Distributions more (less) than income from equity affiliates includes the following:    
Distributions from equity affiliates $ 420 $ 326
(Income) loss from equity affiliates (911) (965)
Distributions more (less) than income from equity affiliates (491) (639)
Net decrease (increase) in operating working capital was composed of the following:    
Decrease (increase) in accounts and notes receivable (2,827) 2,986
Decrease (increase) in inventories 51 (733)
Decrease (increase) in prepaid expenses and other current assets (102) 120
Increase (decrease) in accounts payable and accrued liabilities 1,599 (3,268)
Increase (decrease) in income and other taxes payable 377 (201)
Net decrease (increase) in operating working capital (902) (1,096)
Net cash provided by operating activities includes the following cash payments:    
Interest on debt (net of capitalized interest) 70 106
Income taxes 629 981
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:    
Proceeds and deposits related to asset sales 147 363
Returns of investment from equity affiliates 11 11
Proceeds and deposits related to asset sales and returns of investment 158 374
Net sales (purchases) of marketable securities consisted of the following gross amounts:    
Marketable securities purchased (1) 0
Marketable securities sold 1 0
Net sales (purchases) of marketable securities 0 0
Net repayment (borrowing) of loans by equity affiliates:    
Borrowing of loans by equity affiliates 0 (425)
Repayment of loans by equity affiliates 25 26
Net repayment (borrowing) of loans by equity affiliates 25 (399)
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:    
Proceeds from issuances of short-term obligations 2,872 4,952
Repayments of short-term obligations (1,792) (1,010)
Net borrowings (repayments) of short-term obligations with three months or less maturity 157 4,225
Net borrowings (repayments) of short-term obligations 1,237 8,167
Net sales (purchases) of treasury shares consists of the following gross and net amounts:    
Shares issued for share-based compensation plans 273 178
Shares purchased under share repurchase and deferred compensation plans (6) (1,751)
Net sales (purchases) of treasury shares 267 (1,573)
Capital expenditures    
Additions to properties, plant and equipment 1,631 3,071
Additions to investments 109 13
Current-year dry hole expenditures 4 49
Payments for other assets and liabilities, net 2 0
Capital expenditures 1,746 3,133
Expensed exploration expenditures 82 108
Assets acquired through finance lease obligations and other financing obligations 0 0
Payments for other assets and liabilities, net (2) 0
Capital and exploratory expenditures, excluding equity affiliates 1,826 3,241
Company's share of expenditures by equity affiliates 678 1,183
Capital and exploratory expenditures, including equity affiliates $ 2,504 $ 4,424