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ACCOUNTING POLICIES - Depreciation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property and equipment |  |  |
Depreciation expense | $ 105 | $ 132 | $ 132
Buildings | Minimum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 2.00% |  |
Buildings | Maximum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 10.00% |  |
Computer hardware and software | Minimum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 17.00% |  |
Computer hardware and software | Maximum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 33.00% |  |
Machinery and equipment | Minimum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 5.00% |  |
Machinery and equipment | Maximum |  |  |
Property and equipment |  |  |
Annual depreciation rates (as a percent) | 33.00% |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + 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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