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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Summary of the activity of capitalized exploratory well costs for continuing operations | The following table summarizes the activity of capitalized exploratory well costs for continuing operations for the years ended December 31:
in millions |  | 2018 |  | 2017 |  | 2016
Balance — Beginning of Year |  | $ | 108 |  |  | $ | 56 |  |  | $ | 76 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  | 220 |  |  | 201 |  |  | 29 |
Reclassifications to property, plant and equipment based on the determination of proved reserves |  | (198 | ) |  | (128 | ) |  | (28 | )
Capitalized exploratory well costs charged to expense |  | (18 | ) |  | (21 | ) |  | (21 | )
Balance — End of Year |  | $ | 112 |  |  | $ | 108 |  |  | $ | 56 |
Summary of the activity of the asset retirement obligation | The following table summarizes the activity of the asset retirement obligations, of which $1.4 billion and $1.2 billion is included in deferred credits and other liabilities - asset retirement obligations as of December 31, 2018 and 2017, respectively, with the remaining current portion in accrued liabilities.
For the years ended December 31, (in millions) |  | 2018 |  | 2017
Beginning balance |  | $ | 1,312 |  |  | $ | 1,369 |
Liabilities incurred – capitalized to PP&E |  | 31 |  |  | 46 |
Liabilities settled and paid |  | (40 | ) |  | (39 | )
Accretion expense |  | 67 |  |  | 67 |
Acquisitions, dispositions and other – changes in PP&E |  | (18 | ) |  | (136 | )
Revisions to estimated cash flows – changes in PP&E |  | 147 |  |  | 5 |
Ending balance |  | $ | 1,499 |  |  | $ | 1,312 |

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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