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Information Relating to the Consolidated Statement of Cash Flows - Summary of Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Net decrease (increase) in operating working capital was composed of the following:    
Decrease (increase) in accounts and notes receivable $ 2,254 $ (1,741)
Decrease (increase) in inventories (20) (749)
Decrease (increase) in prepaid expenses and other current assets (286) (310)
Increase (decrease) in accounts payable and accrued liabilities (981) 887
Increase (decrease) in income and other taxes payable 159 31
Net decrease (increase) in operating working capital 1,126 (1,882)
Net cash provided by operating activities includes the following cash payments:    
Interest on debt (net of capitalized interest) 579 502
Income taxes 3,516 3,526
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:    
Proceeds and deposits related to asset sales 1,021 1,872
Returns of investment from equity affiliates 67 244
Proceeds and deposits related to asset sales and returns of investment 1,088 2,116
Net maturities (investments) of time deposits consisted of the following gross amounts:    
Investments in time deposits 0 0
Time deposits matured 950 0
Net sales (purchases) of time deposits 950 0
Net sales (purchases) of marketable securities consisted of the following gross amounts:    
Marketable securities purchased (1) (51)
Marketable securities sold 3 0
Net sales (purchases) of marketable securities 2 (51)
Net repayment (borrowing) of loans by equity affiliates:    
Borrowing of loans by equity affiliates (1,050) 0
Repayment of loans by equity affiliates 80 78
Net repayment (borrowing) of loans by equity affiliates (970) 78
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:    
Proceeds from issuances of short-term obligations 1,821 2,452
Repayments of short-term obligations (570) (3,379)
Net borrowings (repayments) of short-term obligations with three months or less maturity 722 3,126
Net borrowings (repayments) of short-term obligations 1,973 2,199
Capital expenditures    
Additions to properties, plant and equipment 9,713 9,489
Additions to investments 69 36
Current-year dry hole expenditures 111 276
Payments for other assets and liabilities, net 13 0
Capital expenditures 9,906 9,801
Expensed exploration expenditures 361 364
Assets acquired through finance lease obligations and other financing obligations 146 65
Payments for other assets and liabilities, net (13) 0
Capital and exploratory expenditures, excluding equity affiliates 10,400 10,230
Company's share of expenditures by equity affiliates 4,578 4,115
Capital and exploratory expenditures, including equity affiliates $ 14,978 $ 14,345