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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 20,270 | $ 20,038
Accumulated Amortization | 6,605 | 6,251
Unamortized: Trademarks and Other | 2,074 | 2,096
Total Intangible Assets Gross Excluding Goodwill | 22,344 | 22,134
Service portfolios [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 2,187 | 2,178
Accumulated Amortization | 1,588 | 1,534
Patents and trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 364 | 399
Accumulated Amortization | 226 | 233
Collaboration intangible assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 4,294 | 4,109
Accumulated Amortization | 510 | 384
Customer relationships and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 13,425 | 13,352
Accumulated Amortization | $ 4,281 | $ 4,100

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