Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross Amount | $ 18,924 | $ 18,104 |
| Accumulated Amortization | 5,192 | 4,570 |
| Unamortized: Trademarks and Other | 2,068 | 2,069 |
| Total Intangible Assets Gross Excluding Goodwill | 20,992 | 20,173 |
| Service portfolios [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross Amount | 2,068 | 1,977 |
| Accumulated Amortization | 1,404 | 1,307 |
| Patents and trademarks [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross Amount | 379 | 361 |
| Accumulated Amortization | 202 | 189 |
| IAE collaboration [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross Amount | 3,637 | 3,336 |
| Accumulated Amortization | 176 | 86 |
| Customer relationships and other [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross Amount | 12,840 | 12,430 |
| Accumulated Amortization | $ 3,410 | $ 2,988 |