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Revenues - Customer Concentration, Product Sales (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | $ 23,362 | $ 23,747 | $ 22,849
Product [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales | $ 5,881 | $ 5,463 | $ 5,574 | $ 5,286 | $ 6,001 | $ 5,510 | $ 5,679 | $ 5,343 | 22,204 | 22,533 | 21,795
Product [Member] | AmerisourceBergen Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | $ 12,301 | $ 12,091 | $ 10,742
Gross product sales to major customer (as defined) as a percentage of total gross revenues |  |  |  |  |  |  |  |  | 33.00% | 33.00% | 31.00%
Product [Member] | McKesson Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | $ 11,795 | $ 11,434 | $ 10,625
Gross product sales to major customer (as defined) as a percentage of total gross revenues |  |  |  |  |  |  |  |  | 31.00% | 31.00% | 30.00%
Product [Member] | Cardinal Health, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | $ 6,538 | $ 7,475 | $ 7,049
Gross product sales to major customer (as defined) as a percentage of total gross revenues |  |  |  |  |  |  |  |  | 17.00% | 20.00% | 20.00%

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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