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Summary of Significant Accounting Policies - Property, plant and equipment and depreciation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, plant and equipment and depreciation |  |  |
Depreciation expense | $ 217 | $ 179 | $ 171
Building | Minimum |  |  |
Property, plant and equipment and depreciation |  |  |
Useful life | 25 years |  |
Building | Maximum |  |  |
Property, plant and equipment and depreciation |  |  |
Useful life | 50 years |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |
Property, plant and equipment and depreciation |  |  |
Useful life | 2 years |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |
Property, plant and equipment and depreciation |  |  |
Useful life | 25 years |  |

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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=109223946&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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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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