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Segment information (Customer Concentration, Product Sales) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues Earned from Major Customers [Abstract] |  |  |
Revenues | $ 22,849 | $ 22,991 | $ 21,662
AmerisourceBergen Corporation [Member] |  |  |
Revenues Earned from Major Customers [Abstract] |  |  |
Revenues | $ 10,742 | $ 10,100 | $ 10,038
Gross product sales to major customer (as defined) as a percentage of total gross revenues | 31.00% | 31.00% | 34.00%
Gross product sales to major customer (as defined) as a percentage of U.S. gross product sales | 37.00% | 38.00% | 42.00%
McKesson Corporation [Member] |  |  |
Revenues Earned from Major Customers [Abstract] |  |  |
Revenues | $ 10,625 | $ 9,710 | $ 8,766
Gross product sales to major customer (as defined) as a percentage of total gross revenues | 30.00% | 30.00% | 30.00%
Gross product sales to major customer (as defined) as a percentage of U.S. gross product sales | 35.00% | 34.00% | 34.00%
Cardinal Health, Inc. [Member] |  |  |
Revenues Earned from Major Customers [Abstract] |  |  |
Revenues | $ 7,049 | $ 6,520 | $ 5,045
Gross product sales to major customer (as defined) as a percentage of total gross revenues | 20.00% | 20.00% | 17.00%
Gross product sales to major customer (as defined) as a percentage of U.S. gross product sales | 24.00% | 24.00% | 21.00%

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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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