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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the net carrying amount of goodwill by operating segment | The changes in the net carrying amount of goodwill for the three months ended March 31, 2017 are as follows (in millions):
Balance as of January 1, 2017 | $ | 7,410 |
Goodwill related to current year acquisitions | 33 |
Goodwill related to disposals | — |
Goodwill related to prior year acquisitions | (21 | )
Foreign currency translation | 122 |
Balance as of March 31, 2017 | $ | 7,544 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| March 31, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Intangible assets with indefinite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tradenames | $ | 999 |  |  | $ | — |  |  | $ | 999 |  |  | $ | 998 |  |  | $ | — |  |  | $ | 998 |
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer related and contract based | 2,069 |  |  | 1,253 |  |  | 816 |  |  | 2,023 |  |  | 1,198 |  |  | 825 |
Technology and other | 388 |  |  | 317 |  |  | 71 |  |  | 376 |  |  | 309 |  |  | 67 |
Total | $ | 3,456 |  |  | $ | 1,570 |  |  | $ | 1,886 |  |  | $ | 3,397 |  |  | $ | 1,507 |  |  | $ | 1,890 |
Schedule of estimated future amortization expense on intangible assets | The estimated future amortization for finite lived intangible assets as of March 31, 2017 is as follows (in millions):
|  |  | Subsequent Event
| As of March 31, 2017 |  | Estimated Impairment Charge (1) |  | Estimated Tradename Amortization (2) |  | Revised Estimated Total Future Amortization
Remainder of 2017 | $ | 131 |  |  | $ | 400 |  |  | $ | 137 |  |  | $ | 668 |
2018 | 155 |  |  | — |  |  | 206 |  |  | 361 |
2019 | 137 |  |  | — |  |  | 206 |  |  | 343 |
2020 | 121 |  |  | — |  |  | 68 |  |  | 189 |
2021 | 87 |  |  | — |  |  | (1 | ) |  | 86 |
Thereafter | 256 |  |  | — |  |  | (17 | ) |  | 239 |
Total | $ | 887 |  |  | $ | 400 |  |  | $ | 599 |  |  | $ | 1,886 |
(1) | In the second quarter of 2017, in connection with the completion of the sale of the Divested Business, the Company expects to recognize a non-cash impairment charge to the associated indefinite lived tradename of approximately $400 million. Refer to Note 3 “Discontinued Operations” for further information.
(2) | Additionally, effective May 1, 2017, consistent with operating as one segment, the Company has implemented a three-year strategy to transition to a unified Aon brand. As a result, Aon commenced amortization of all indefinite lived tradenames and prospectively accelerated amortization of its finite lived tradenames over the three-year period.

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