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Segment Information - Net sales by region (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 6,763 | $ 7,362 | $ 7,149
Percentage of entity's revenue | 100.00% | 100.00% | 100.00%
Total of selected non-current asset | $ 21,785 | $ 22,573 |
Percentage of entity's non-current asset | 100.00% | 100.00% |
Foreign countries [member] | United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 2,975 | $ 3,055 | $ 2,942
Percentage of entity's revenue | 44.00% | 41.00% | 41.00%
Total of selected non-current asset | $ 10,309 | $ 10,559 |
Percentage of entity's non-current asset | 47.00% | 47.00% |
Foreign countries [member] | Japan [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 650 | $ 656 | $ 593
Percentage of entity's revenue | 10.00% | 9.00% | 8.00%
Total of selected non-current asset | $ 63 | $ 66 |
Percentage of entity's non-current asset | 0.00% | 0.00% |
Foreign countries [member] | China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 383 | $ 377 | $ 341
Percentage of entity's revenue | 6.00% | 5.00% | 5.00%
Total of selected non-current asset | $ 16 | $ 18 |
Percentage of entity's non-current asset | 0.00% | 0.00% |
Foreign countries [member] | Other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 2,700 | $ 3,218 | $ 3,216
Percentage of entity's revenue | 40.00% | 44.00% | 45.00%
Total of selected non-current asset | $ 1,660 | $ 1,444 |
Percentage of entity's non-current asset | 8.00% | 6.00% |
International [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 3,788 | $ 4,307 | $ 4,207
Percentage of entity's revenue | 56.00% | 59.00% | 59.00%
Total of selected non-current asset | $ 11,476 | $ 12,014 |
Percentage of entity's non-current asset | 53.00% | 53.00% |
Country of domicile [member] | Switzerland [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales to third parties | $ 55 | $ 56 | $ 57
Percentage of entity's revenue | 1.00% | 1.00% | 1.00%
Total of selected non-current asset | $ 9,737 | $ 10,486 |
Percentage of entity's non-current asset | 45.00% | 46.00% |

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- Definition Non-current Assets Including Property, Plant & Equipment, Right Of Use Assets, Goodwill And Other Intangible Assets + References No definition available. + Details
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- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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