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Summary of Significant Accounting Principles and Practices (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of estimated useful lives of assets | Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets, which are generally as follows:
Asset Description |  | Estimated Useful Life
Software |  | Lesser of the life of an associated license, or 4 to 7 years
Leasehold improvements |  | Lesser of estimated useful life or lease term, not to exceed 10 years
Furniture, fixtures and equipment |  | 4 to 10 years
Computer equipment |  | 4 to 6 years
Buildings |  | 35 years
Automobiles |  | 6 years
Schedule of other intangible assets by asset class | Amortization basis and estimated useful lives by intangible asset type are generally as follows:
Intangible Asset Description |  | Amortization Basis |  | Estimated Useful Life
Tradenames |  | Straight-line |  | 1 to 3 years
Customer-related and contract-based |  | In line with underlying cash flows |  | 7 to 20 years
Technology and other |  | Straight-line |  | 5 to 7 years
Other intangible assets by asset class are as follows (in millions):
| As of December 31
| 2019 |  | 2018
| 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 | $ | 2,264 |  |  | $ | 1,600 |  |  | $ | 664 |  |  | $ | 2,240 |  |  | $ | 1,444 |  |  | $ | 796 |
Tradenames | 1,029 |  |  | 956 |  |  | 73 |  |  | 1,027 |  |  | 740 |  |  | 287 |
Technology and other | 380 |  |  | 334 |  |  | 46 |  |  | 391 |  |  | 325 |  |  | 66 |
Total | $ | 3,673 |  |  | $ | 2,890 |  |  | $ | 783 |  |  | $ | 3,658 |  |  | $ | 2,509 |  |  | $ | 1,149 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | As a result of applying the modified retrospective approach to adopt the new leasing standard, the following adjustments were made to the Consolidated Statement of Financial Position as of January 1, 2019 (in millions):
| December 31, 2018 |  |  |  | January 1, 2019
| As Reported |  | Adjustments |  | As Adjusted
Assets |  |  |  |  |
Operating lease right-of-use assets | $ | — |  |  | $ | 1,021 |  |  | $ | 1,021 |
Other non-current assets | $ | 448 |  |  | $ | 78 |  |  | $ | 526 |
Liabilities |  |  |  |  |
Other current liabilities | $ | 936 |  |  | $ | 219 |  |  | $ | 1,155 |
Non-current operating lease liabilities | $ | — |  |  | $ | 1,014 |  |  | $ | 1,014 |
Other non-current liabilities | $ | 1,097 |  |  | $ | (134 | ) |  | $ | 963 |

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