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Financial Instruments, Derivatives and Hedging Activities - Commodity price hedging (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financial instruments, derivatives and hedging activities |  |
Accumulated gains (losses) from derivative instruments, net of tax effect | $ (1,154) | $ (1,013)
Commodity Contracts | Minimum |  |
Financial instruments, derivatives and hedging activities |  |
Maturity period of price risk derivative | 12 months |
Commodity Contracts | Maximum |  |
Financial instruments, derivatives and hedging activities |  |
Maturity period of price risk derivative | 24 months |
Cash Flow Hedging | Commodity Contracts |  |
Financial instruments, derivatives and hedging activities |  |
Accumulated gains (losses) from derivative instruments, net of tax effect | $ (2) | (12)
Tax effect on gain (loss) on derivative instruments | $ (2) | $ (7)

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- Definition Total tax effect of the accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. + References No definition available. + Details
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- Definition General period of time over which entity hedges its exposure to commodity price risk. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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