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Change in Accounting Principle - Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net income (loss) | $ (308) | $ 228 | $ (502)
Depreciation, depletion and amortization | 2,264 | 1,737 | 1,697
Loss on sale of oil and gas properties | 0 | 0 |
(Gains) losses on sales of assets | (43) | 264 | (476)
Impairments | 11 | 131 | 814
Exploration | 49 | 96 | 214
Other | (4) | (118) | (132)
(Decrease) increase in accounts payable, accrued liabilities and other | (630) | 75 | (375)
Net Cash Provided By Operating Activities | 1,623 | 1,730 | 475
Drilling and completion costs | (2,180) | (1,848) | (2,113)
Acquisitions of proved and unproved properties | (35) | (128) | (88)
Net Cash Provided By (Used In) Investing Activities | (2,480) | 455 | (918)
As Previously Reported Under Full Cost |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net income (loss) | 211 | 877 | 953
Depreciation, depletion and amortization | 1,616 | 1,145 | 995
Loss on sale of oil and gas properties | (15) | 578 |
(Gains) losses on sales of assets | 0 | 0 | 0
Impairments | 344 | 53 | 5
Exploration | 0 | 0 | 0
Other | (2) | (108) | (135)
(Decrease) increase in accounts payable, accrued liabilities and other | (567) | 138 | (308)
Net Cash Provided By Operating Activities | 1,871 | 2,000 | 745
Drilling and completion costs | (2,260) | (1,958) | (2,186)
Acquisitions of proved and unproved properties | (203) | (288) | (285)
Net Cash Provided By (Used In) Investing Activities | (2,728) | 185 | (1,188)
Successful Efforts Adjustment |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net income (loss) | (519) | (649) | (1,455)
Depreciation, depletion and amortization | 648 | 592 | 702
Loss on sale of oil and gas properties | 15 | (578) |
(Gains) losses on sales of assets | (43) | 264 | (476)
Impairments | (333) | 78 | 809
Exploration | 49 | 96 | 214
Other | (2) | (10) | 3
(Decrease) increase in accounts payable, accrued liabilities and other | (63) | (63) | (67)
Net Cash Provided By Operating Activities | (248) | (270) | (270)
Drilling and completion costs | 80 | 110 | 73
Acquisitions of proved and unproved properties | 168 | 160 | 197
Net Cash Provided By (Used In) Investing Activities | $ 248 | $ 270 | $ 270

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- Definition The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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