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Financial instruments - additional disclosures - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum remaining potential payments related to contingent consideration from business combinations | $ 510 |
Contingent consideration liabilities [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Purchases, fair value measurement, liabilities | $ 135 | $ 102
Adjustments for changes in assumptions |  | 62
Interest rate risk [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on loss before taxes | $ 12 |
Commodity price risk [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Reasonably possible change in risk variable, percent | 10.00% |
Level 3 [member] | Contingent consideration liabilities [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Purchases, fair value measurement, liabilities | $ 135 | 102
Adjustments for changes in assumptions | $ 75 | $ 62
Pricing, measurement input [Member] | Long-term financial investments [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percentage of possible increase in unobservable input, assets | 10.00% |
Increase (decrease) in fair value due to increase in unobservable input, assets | $ 3 |
Percentage of reasonably possible decrease in unobservable input, assets | 10.00% |
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, recognised in other comprehensive income, before tax, assets | $ 3 |
Significant parameters, measurement input [Member] | Contingent consideration liabilities [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percentage of possible increase in unobservable input, liabilities | 10.00% |
Increase (decrease) in fair value due to possible increase in unobservable input, recognised in profit or loss, before tax, liabilities | $ 34 |
Percentage of reasonably possible decrease in unobservable input, liabilities | 10.00% |
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, recognised in profit or loss, before tax, liabilities | $ 34 |
Probability of success, measurement input [Member] | Contingent consideration liabilities [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percentage of possible increase in unobservable input, liabilities | 10.00% |
Increase (decrease) in fair value due to possible increase in unobservable input, recognised in profit or loss, before tax, liabilities | $ 32 |
Percentage of reasonably possible decrease in unobservable input, liabilities | 10.00% |
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, recognised in profit or loss, before tax, liabilities | $ 32 |

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- Definition The amount of the estimated financial effect of contingent liabilities in a business combination that were not recognised because their fair value cannot be measured reliably. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph j -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_j_i&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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