The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The commodity price assumption for the next fiscal year, used to determine recoverable value for individual assets or cash-generating units.

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The long-term commodity price assumption used to determine recoverable value for individual assets or cash-generating units.

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- Definition

The amount of impairment loss recognised in profit (loss) from operating activities of the entity.

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The amount of impairment loss recognised in profit or loss, net of tax effect, attributable to owners of the parent.

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The increase (decrease) in profit (loss) from operating activities as a result of a decrease in a designated risk component that was reasonably possible at the end of the reporting period.

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The increase (decrease) in profit (loss) from operating activities as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period.

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The increase (decrease) in profit or loss net of tax, attributable to parent, as a result of a decrease in a designated risk component that was reasonably possible at the end of the reporting period.

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The increase (decrease) in profit or loss net of tax, attributable to parent, as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period.

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The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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- Definition

The pre-tax discount rate used in developing cash flow projections for a cash-generating unit (group of units)

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Business segment information - Asset impairment (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / bbl $ / MMBTU	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Asset impairment
Asset impairments recorded in operating income	$ 4,662	$ 2,229	$ 6,877
Asset impairments recorded in net income, Group share	$ 3,884	$ 2,097	$ 5,447
Post-tax discount rate (as a percent)	7.00%	7.00%	7.00%
Oil assets
Asset impairment
Commodity price assumption for 2018 (in dollars per barrel or million BTU) \| $ / bbl	50
Commodity price assumption, long-term (in dollars per barrel or million BTU) \| $ / bbl	80
Gas assets
Asset impairment
Commodity price assumption for 2018 (in dollars per barrel or million BTU) \| $ / MMBTU	5
Commodity price assumption, long-term (in dollars per barrel or million BTU) \| $ / MMBTU	7
Low
Asset impairment
Pre-tax discount rate (as a percent)	7.00%
High
Asset impairment
Pre-tax discount rate (as a percent)	16.00%
Exploration & Production
Asset impairment
Asset impairments recorded in operating income	$ 4,308
Asset impairments recorded in net income, Group share	$ 3,583
Exploration & Production \| Discount rate
Asset impairment
Reasonably possible decrease in assumption (as a percent)	1.00%
Impact on operating income from decrease in assumption	$ 500
Impact on net income, Group share, from decrease in assumption	$ 300
Reasonably possible increase in assumption (as a percent)	1.00%
Impact on operating income from increase in assumption	$ (1,000)
Impact on net income, Group share, from increase in assumption	$ (800)
Exploration & Production \| Long-term oil and gas prices
Asset impairment
Reasonably possible decrease in assumption (as a percent)	10.00%
Impact on operating income from decrease in assumption	$ (4,900)
Impact on net income, Group share, from decrease in assumption	(4,200)
Exploration & Production \| Long-term oil and gas prices \| Assets already impaired, including GLNG in Australia and assets in Congo
Asset impairment
Impact on operating income from decrease in assumption	(2,800)
Impact on net income, Group share, from decrease in assumption	(2,700)
Exploration & Production \| Long-term oil and gas prices \| Other assets especially in Canada
Asset impairment
Impact on operating income from decrease in assumption	(2,100)
Impact on net income, Group share, from decrease in assumption	(1,500)
Exploration & Production \| Canada \| Fort Hills project assets
Asset impairment
Asset impairments recorded in operating income	1,544
Asset impairments recorded in net income, Group share	1,312
Exploration & Production \| Australia \| Gas assets
Asset impairment
Asset impairments recorded in operating income	509
Asset impairments recorded in net income, Group share	381
Exploration & Production \| Congo \| Oil assets
Asset impairment
Asset impairments recorded in operating income	1,392
Asset impairments recorded in net income, Group share	1,220
Exploration & Production \| United Kingdom \| Gas assets
Asset impairment
Asset impairments recorded in operating income	451
Asset impairments recorded in net income, Group share	271
Gas, Renewables & Power
Asset impairment
Asset impairments recorded in operating income	291
Asset impairments recorded in net income, Group share	238
Refining & Chemicals
Asset impairment
Asset impairments recorded in net income, Group share	$ 53
Refining & Chemicals \| Discount rate
Asset impairment
Reasonably possible decrease in assumption (as a percent)	(1.00%)
Impact on operating income from decrease in assumption	$ 0
Impact on net income, Group share, from decrease in assumption	$ 0
Reasonably possible increase in assumption (as a percent)	1.00%
Impact on operating income from increase in assumption	$ 0
Impact on net income, Group share, from increase in assumption	$ 0
Refining & Chemicals \| Gross margin on variable costs
Asset impairment
Reasonably possible decrease in assumption (as a percent)	(5.00%)
Impact on operating income from decrease in assumption	$ 0
Impact on net income, Group share, from decrease in assumption	$ 0
Reasonably possible increase in assumption (as a percent)	5.00%
Impact on operating income from increase in assumption	$ 0
Impact on net income, Group share, from increase in assumption	$ 0