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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 341 | $ 330 | $ 308
Tax benefit from stock-based compensation expense | (74) | (72) | (67)
Total stock-based compensation expense, net of tax | 267 | 258 | 241
RSUs [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 183 | 178 | 168
Performance units [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 121 | 118 | 105
Stock options [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 37 | $ 34 | $ 35

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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=120381028&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=123570139&loc=d3e3602-108585 + Details
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- Details
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- Details
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