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Information Relating to the Consolidated Statement of Cash Flows - Summary of Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net decrease (increase) in operating working capital was composed of the following:      
Decrease (increase) in accounts and notes receivable $ 437 $ (915) $ (2,121)
Decrease (increase) in inventories (424) (267) 603
Decrease (increase) in prepaid expenses and other current assets (149) 173 829
Increase (decrease) in accounts payable and accrued liabilities (494) 998 366
Increase (decrease) in income and other taxes payable (88) 531 (4)
Net decrease (increase) in operating working capital [1] (718) 520 (327)
Net cash provided by operating activities includes the following cash payments:      
Interest on debt (net of capitalized interest) 736 265 158
Income taxes 4,748 3,132 1,935
Proceeds and deposits related to asset sales and returns of investment consisted of the following gross amounts:      
Proceeds and deposits related to asset sales 2,000 4,930 3,154
Returns of investment from equity affiliates 392 166 322
Proceeds and deposits related to asset sales and returns of investment [1],[2] 2,392 5,096 3,476
Net maturities (investments) of time deposits consisted of the following gross amounts:      
Investments in time deposits (950) 0 0
Time deposits matured 0 0 0
Net sales (purchases) of time deposits (950) 0 0
Net sales (purchases) of marketable securities consisted of the following gross amounts:      
Marketable securities purchased (51) (3) (9)
Marketable securities sold 0 7 306
Net sales (purchases) of marketable securities (51) 4 297
Net repayment (borrowing) of loans by equity affiliates:      
Borrowing of loans by equity affiliates 0 (142) (2,341)
Repayment of loans by equity affiliates 111 126 307
Net repayment (borrowing) of loans by equity affiliates 111 (16) (2,034)
Net borrowings (repayments) of short-term obligations consisted of the following gross and net amounts:      
Proceeds from issuances of short-term obligations 2,486 5,051 14,778
Repayments of short-term obligations (4,136) (8,820) (12,558)
Net borrowings (repayments) of short-term obligations with three months or less maturity 3,671 (1,373) (90)
Net borrowings (repayments) of short-term obligations 2,021 (5,142) 2,130
Capital expenditures      
Additions to properties, plant and equipment 13,384 13,222 17,742
Additions to investments 65 25 55
Current-year dry hole expenditures 344 157 313
Payments for other liabilities and assets, net (1) 0 (1)
Capital expenditures 13,792 13,404 18,109
Expensed exploration expenditures 523 666 544
Assets acquired through capital lease obligations and other financing obligations 75 8 5
Capital and exploratory expenditures, excluding equity affiliates 14,390 14,078 18,658
Company's share of expenditures by equity affiliates 5,716 4,743 3,770
Capital and exploratory expenditures, including equity affiliates 20,106 18,821 22,428
Non-cash additions to properties, plant and equipment $ 25 $ 1,183 $ 56
[1] 2017 and 2016 adjusted to conform to ASU 2016-18. Refer to Note 3, "Information Relating to the Consolidated Statement of Cash Flows" beginning on page 59.
[2] 2017 and 2016 adjusted to conform to ASU 2016-15. Refer to Note 3, "Information Relating to the Consolidated Statement of Cash Flows" beginning on page 59.