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Suspended Exploratory Well Costs | 12 Months Ended
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Dec. 31, 2017
SUSPENDED EXPLORATORY WELL COSTS |
SUSPENDED EXPLORATORY WELL COSTS | 39. SUSPENDED EXPLORATORY WELL COSTS
($ millions) |  | 2017 |  | 2016 |  |
Beginning of year |  | — |  | 212 |  |
Additions |  | — |  | 209 |  |
Transfers to oil and gas assets |  | — |  | (65 | ) |
Capitalized exploratory well costs charged to expense |  | — |  | (356 | ) |
End of year |  | — |  | — |  |
At December 31, 2017 and December 31, 2016, there were no suspended capitalized costs for exploratory wells. During 2016, one well was transferred to oil and gas assets as the project received sanction, and the remaining wells were impaired to a zero carrying value due to uncertainty around plans for future development.

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- Definition The entire disclosure for parts or all of the information related to suspended well costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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