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Stock-based compensation (Components of Stock-based Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 308 | $ 311 | $ 329
Tax benefit from stock-based compensation expense | (67) | (67) | (118)
Total stock-based compensation expense, net of tax | 241 | 244 | 211
RSUs [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 168 | 165 | 174
Performance units [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 105 | 117 | 133
Stock options [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 35 | $ 29 | $ 22

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- Definition Total stock-based compensation expense, net of tax. + References No definition available. + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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- Details
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- Details
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- Details
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