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Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Assets [Abstract] |
Other assets | The following is a summary of Other assets as of December 31:
(Millions) |  | 2020 |  | 2019
Goodwill |  | $ | 3,852 |  |  | $ | 3,315 |
Other intangible assets, at amortized cost |  | 265 |  |  | 267 |
Other(a) |  | 13,562 |  |  | 10,635 |
Total |  | $ | 17,679 |  |  | $ | 14,217 |
(a)Primarily includes prepaid assets, net deferred tax assets, other receivables net of reserves, investments in non-consolidated entities, tax credit investments and right-of-use lease assets.
Changes in carrying amount of goodwill | The changes in the carrying amount of goodwill reported in our reportable operating segments were as follows:
(Millions) |  | GCSG |  | GCS |  | GMNS |  | Total
Balance as of December 31, 2018 |  | $ | 707 |  |  | $ | 1,718 |  |  | $ | 647 |  |  | $ | 3,072 |
Acquisitions |  | 189 |  |  | 66 |  |  | — |  |  | 255 |
Dispositions |  | — |  |  | — |  |  | — |  |  | — |
Other(a) |  | (7) |  |  | (3) |  |  | (2) |  |  | (12) |
Balance as of December 31, 2019 |  | $ | 889 |  |  | $ | 1,781 |  |  | $ | 645 |  |  | $ | 3,315 |
Acquisitions |  | — |  |  | 442 |  |  | 52 |  |  | 494 |
Dispositions |  | — |  |  | — |  |  | — |  |  | — |
Other(a) |  | 25 |  |  | 11 |  |  | 7 |  |  | 43 |
Balance as of December 31, 2020 |  | $ | 914 |  |  | $ | 2,234 |  |  | $ | 704 |  |  | $ | 3,852 |
(a)Primarily includes foreign currency translation.

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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=121556970&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=121556970&loc=d3e13854-109267 + Details
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