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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 20,449 | $ 20,038
Accumulated Amortization | 6,822 | 6,251
Unamortized: Trademarks and Other | 2,074 | 2,096
Total Intangible Assets Gross Excluding Goodwill | 22,523 | 22,134
Service portfolios [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 2,181 | 2,178
Accumulated Amortization | 1,604 | 1,534
Patents and trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 362 | 399
Accumulated Amortization | 232 | 233
Collaboration intangible assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 4,413 | 4,109
Accumulated Amortization | 573 | 384
Customer relationships and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 13,493 | 13,352
Accumulated Amortization | $ 4,413 | $ 4,100

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