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- Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | $ 3,738 | $ 4,013
Accumulated Amortization and Impairment |  | 2,375 | 2,280
Net Carrying Amount |  | 1,363 | 1,733
Intangible assets held for sale |  | 258 |
Intangible assets accumulated amortization held for sale |  | 94 |
Estimated amortization for intangible assets |  |  |
Remainder of 2018 |  | 205 |
2019 |  | 401 |
2020 |  | 228 |
2021 |  | 131 |
2022 |  | 85 |
Thereafter |  | 313 |
Total |  | 1,363 |
Customer related and contract based |  |  |
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | 2,310 | 2,550
Accumulated Amortization and Impairment |  | 1,417 | 1,415
Net Carrying Amount |  | 893 | 1,135
Tradenames |  |  |
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | 1,031 | 1,047
Accumulated Amortization and Impairment |  | 634 | 533
Net Carrying Amount |  | 397 | 514
Technology and other |  |  |
Intangible assets with finite lives |  |  |
Gross Carrying Amount |  | 397 | 416
Accumulated Amortization and Impairment |  | 324 | 332
Net Carrying Amount |  | $ 73 | $ 84
Discontinued Operations, Disposed of by Sale | Tempo Business | Tradenames |  |  |
Intangible assets with finite lives |  |  |
Impairment of tradename | $ 380 |  |

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