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Segment information (Revenues by Geographic Information) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Geographical Information With Respect To Revenues [Abstract] |  |  |
Revenues | $ 22,849 | $ 22,991 | $ 21,662
United States [Member] |  |  |
Geographical Information With Respect To Revenues [Abstract] |  |  |
Revenues | 18,029 | 18,326 | 17,167
Rest of the world (ROW) [Member] |  |  |
Geographical Information With Respect To Revenues [Abstract] |  |  |
Revenues | $ 4,820 | $ 4,665 | $ 4,495

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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