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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows from Operating Activities    
Net Income $ 677 $ 10
Items Not Requiring (Providing) Cash    
Depreciation, Depletion and Amortization 900 1,000
Impairments 44 1,573
Stock-Based Compensation Expenses 35 40
Deferred Income Taxes (36) 45
Gains (Losses) on Asset Dispositions, Net (6) 16
Other, Net 7 (9)
Dry Hole Costs 11 0
Total (Gains) Losses 367 (1,206)
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts (30) 84
Mark-to-Market Commodity Derivative Contracts    
Other, Net 1 0
Changes in Components of Working Capital and Other Assets and Liabilities    
Accounts Receivable (308) 722
Inventories 64 103
Accounts Payable 172 434
Accrued Taxes Payable 243 (55)
Other Assets (103) 58
Other Liabilities (89) (66)
Changes in Components of Working Capital Associated with Investing and Financing Activities (91) (132)
Net Cash Provided by Operating Activities 1,870 2,585
Investing Cash Flows    
Additions to Oil and Gas Properties (875) (1,566)
Additions to Other Property, Plant and Equipment (42) (123)
Proceeds from Sales of Assets 5 26
Changes in Components of Working Capital Associated with Investing Activities 91 132
Net Cash Used in Investing Activities (821) (1,531)
Financing Cash Flows    
Long-Term Debt Repayments (750) 0
Dividends Paid (219) (167)
Treasury Stock Purchased (10) (5)
Repayment of Finance Lease Liabilities (9) (3)
Net Cash Used in Financing Activities (988) (175)
Effect of Exchange Rate Changes on Cash (2) 0
Increase in Cash and Cash Equivalents 59 879
Cash and Cash Equivalents at End of Period 3,388 2,907
Cash and Cash Equivalents at Beginning of Period $ 3,329 $ 2,028