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Summary of significant accounting policies (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) segment | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |
Number of operating segments | segment | 1 |  |
Accumulated depreciation and amortization on property, plant and equipment | $ 8,100 |  | $ 7,800
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Lease liabilities | 497 |  |
ROU asset | $ 430 |  |
New Lease Standard |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Lease liabilities |  | $ 510 |
ROU asset |  | $ 439 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + 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 (c) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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