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Information Relating to the Consolidated Statement of Cash Flows - Summary of Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Distributions more (less) than income from equity affiliates includes the following:    
Distributions from equity affiliates $ 936 $ 728
(Income) loss from equity affiliates (2,353) 1,550
Distributions more (less) than income from equity affiliates (1,417) 2,278
Net decrease (increase) in operating working capital was composed of the following:    
Decrease (increase) in accounts and notes receivable (4,725) 4,769
Decrease (increase) in inventories (471) 371
Decrease (increase) in prepaid expenses and other current assets (1) 392
Increase (decrease) in accounts payable and accrued liabilities 3,751 (4,812)
Increase (decrease) in income and other taxes payable 414 (1,093)
Net decrease (increase) in operating working capital (1,032) (373)
Net cash provided by operating activities includes the following cash payments:    
Interest on debt (net of capitalized interest) 355 328
Income taxes 1,939 2,142
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:    
Proceeds and deposits related to asset sales 352 1,821
Returns of investment from equity affiliates 17 31
Proceeds and deposits related to asset sales and returns of investment 369 1,852
Net sales (purchases) of marketable securities consisted of the following gross amounts:    
Marketable securities purchased (3) (1)
Marketable securities sold 3 0
Net sales (purchases) of marketable securities 0 (1)
Net repayment (borrowing) of loans by equity affiliates:    
Borrowing of loans by equity affiliates 0 (1,100)
Repayment of loans by equity affiliates 39 26
Net repayment (borrowing) of loans by equity affiliates 39 (1,074)
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:    
Proceeds from issuances of short-term obligations 4,449 7,922
Repayments of short-term obligations (3,910) (2,150)
Net borrowings (repayments) of short-term obligations with three months or less maturity 1,409 (3,201)
Net borrowings (repayments) of short-term obligations 1,948 2,571
Net sales (purchases) of treasury shares consists of the following gross and net amounts:    
Shares issued for share-based compensation plans 381 201
Shares purchased under share repurchase and deferred compensation plans (8) (1,751)
Net sales (purchases) of treasury shares 373 (1,550)
Capital expenditures    
Additions to properties, plant and equipment 3,354 4,991
Additions to investments 168 44
Current-year dry hole expenditures 19 223
Payments for other assets and liabilities, net 2 (33)
Capital expenditures 3,543 5,225
Expensed exploration expenditures 180 208
Assets acquired through finance lease obligations and other financing obligations 42 6
Payments for other assets and liabilities, net (2) 33
Capital and exploratory expenditures, excluding equity affiliates 3,763 5,472
Company's share of expenditures by equity affiliates 1,527 2,258
Capital and exploratory expenditures, including equity affiliates $ 5,290 $ 7,730