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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 29,819 | $ 29,559
Accumulated Amortization | 7,779 | 7,053
Unamortized: Trademarks and Other | 3,923 | 3,918
Total Intangible Assets Gross Excluding Goodwill | 33,742 | 33,477
Service portfolios [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 2,179 | 2,164
Accumulated Amortization | 1,656 | 1,608
Patents and trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 361 | 361
Accumulated Amortization | 245 | 236
Collaboration intangible assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 4,681 | 4,509
Accumulated Amortization | 779 | 649
Customer relationships and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 22,598 | 22,525
Accumulated Amortization | $ 5,099 | $ 4,560

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