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- Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | $ 3,731 | $ 4,013
Accumulated Amortization and Impairment |  | 2,471 | 2,280
Net Carrying Amount |  | 1,260 | 1,733
Estimated amortization for intangible assets |  |  |
Remainder of 2018 |  | 100 |
2019 |  | 386 |
2020 |  | 222 |
2021 |  | 128 |
2022 |  | 85 |
Thereafter |  | 339 |
Total |  | 1,260 |
Customer related and contract based |  |  |
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | 2,305 | 2,550
Accumulated Amortization and Impairment |  | 1,457 | 1,415
Net Carrying Amount |  | 848 | 1,135
Tradenames |  |  |
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | 1,030 | 1,047
Accumulated Amortization and Impairment |  | 687 | 533
Net Carrying Amount |  | 343 | 514
Technology and other |  |  |
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | 396 | 416
Accumulated Amortization and Impairment |  | 327 | 332
Net Carrying Amount |  | $ 69 | $ 84
Discontinued Operations, Disposed of by Sale | Tempo Business | Tradenames |  |  |
Intangible assets with finite lives |  |  |
Impairment of tradename | $ 380 |  |

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