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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, 2019
Mar. 31, 2018
Net decrease (increase) in operating working capital was composed of the following:    
Decrease (increase) in accounts and notes receivable $ 473 $ (335)
Decrease (increase) in inventories (1,098) (543)
Decrease (increase) in prepaid expenses and other current assets (667) (608)
Increase (decrease) in accounts payable and accrued liabilities (160) (807)
Increase (decrease) in income and other taxes payable 242 189
Net decrease (increase) in operating working capital (1,210) (2,104)
Net cash provided by operating activities includes the following cash payments:    
Interest on debt (net of capitalized interest) 186 105
Income taxes 757 843
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:    
Proceeds and deposits related to asset sales 276 31
Returns of investment from equity affiliates 18 80
Proceeds and deposits related to asset sales and returns of investment 294 111
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) (29)
Marketable securities sold 3 0
Net sales (purchases) of marketable securities 2 (29)
Net repayment (borrowing) of loans by equity affiliates:    
Borrowing of loans by equity affiliates (350) 0
Repayment of loans by equity affiliates 29 26
Net repayment (borrowing) of loans by equity affiliates (321) 26
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:    
Proceeds from issuances of short-term obligations 359 658
Repayments of short-term obligations (134) (1,377)
Net borrowings (repayments) of short-term obligations with three months or less maturity 711 3,933
Net borrowings (repayments) of short-term obligations 936 3,214
Capital expenditures    
Additions to properties, plant and equipment 2,865 2,937
Additions to investments 14 15
Current-year dry hole expenditures 74 45
Payments for other liabilities and assets, net 0 0
Capital expenditures 2,953 2,997
Expensed exploration expenditures 103 113
Assets acquired through finance lease obligations and other financing obligations 146 0
Capital and exploratory expenditures, excluding equity affiliates 3,202 3,110
Company's share of expenditures by equity affiliates 1,532 1,295
Capital and exploratory expenditures, including equity affiliates $ 4,734 $ 4,405