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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2018
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 six months ended June 30, 2018 are as follows (in millions):
Balance as of December 31, 2017 | $ | 8,358 |
Goodwill related to current year acquisitions | 31 |
Goodwill related to disposals | (1 | )
Goodwill related to prior year acquisitions | 10 |
Foreign currency translation and other | (107 | )
Balance as of June 30, 2018 | $ | 8,291 |
Schedule of Other Intangible Assets by Asset Class | Other intangible assets by asset class are as follows (in millions):
| June 30, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Carrying Amount
Customer related and contract based | $ | 2,310 |  |  | $ | 1,417 |  |  | $ | 893 |  |  | $ | 2,550 |  |  | $ | 1,415 |  |  | $ | 1,135 |
Tradenames | 1,031 |  |  | 634 |  |  | 397 |  |  | 1,047 |  |  | 533 |  |  | 514 |
Technology and other | 397 |  |  | 324 |  |  | 73 |  |  | 416 |  |  | 332 |  |  | 84 |
Total | $ | 3,738 |  |  | $ | 2,375 |  |  | $ | 1,363 |  |  | $ | 4,013 |  |  | $ | 2,280 |  |  | $ | 1,733 |
Schedule of Estimated Future Amortization Expense on Intangible Assets | The estimated future amortization for finite lived intangible assets as of June 30, 2018 is as follows (in millions):
Remainder of 2018 | $ | 205 |
2019 | 401 |
2020 | 228 |
2021 | 131 |
2022 | 85 |
Thereafter | 313 |
Total | $ | 1,363 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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