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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 329 | $ 311 | $ 322
Tax benefit from stock-based compensation expense | (118) | (112) | (120)
Total stock-based compensation expense, net of tax | 211 | 199 | 202
RSUs [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 174 | 177 | 190
Performance units [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | 133 | 123 | 132
Stock options [Member] |  |  |
Components of stock-based compensation expense [Abstract] |  |  |
Total stock-based compensation expense, pretax | $ 22 | $ 11 | $ 0

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- Definition Total stock-based compensation expense, net of tax. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&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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