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Other Financial Data | 12 Months Ended
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Dec. 31, 2020
Other Financial Data [Abstract] |
Other Financial Data | Other Financial Data Consolidated Statements of Income Information Other Income (Expense) The components of Other income (expense) are as follows (in millions):
| Years ended December 31
| 2020 |  | 2019 |  | 2018
Foreign currency remeasurement | $ | (12) |  |  | $ | 9 |  |  | $ | 25 |
Disposal of businesses | 25 |  |  | 13 |  |  | (6) |
Pension and other postretirement | 13 |  |  | 9 |  |  | 1 |
Equity earnings | 4 |  |  | 4 |  |  | 4 |
Extinguishment of debt | (7) |  |  | — |  |  | — |
Financial instruments | (11) |  |  | (34) |  |  | (49) |
Total | $ | 12 |  |  | $ | 1 |  |  | $ | (25) |
Consolidated Statements of Financial Position Information Allowance for Doubtful Accounts Changes in the net carrying amount of allowance for doubtful accounts are as follows (in millions):
| 2020 |  | 2019 |  | 2018
Balance at beginning of period | $ | 70 |  |  | $ | 62 |  |  | $ | 59 |
Adoption of new accounting guidance (1) | 7 |  |  | — |  |  | — |
Adjusted balance at beginning of period | 77 |  |  | 62 |  |  | 59 |
Provision | 29 |  |  | 27 |  |  | 24 |
Accounts written off, net of recoveries | (6) |  |  | (19) |  |  | (25) |
Foreign currency translation and other | (2) |  |  | — |  |  | 4 |
Balance at end of period | $ | 98 |  |  | $ | 70 |  |  | $ | 62 |
(1) The allowance for doubtful accounts resulted in a $7 million charge from the adoption of the new accounting standard on the measurement of credit losses on January 1, 2020. After tax impacts, this resulted in a $6 million decrease to Retained earnings. Refer to Note 2 “Summary of Significant Accounting Principles and Practices” for further information. Other Current Assets The components of Other current assets are as follows (in millions):
As of December 31 | 2020 |  | 2019
Costs to fulfill contracts with customers | $ | 339 |  |  | $ | 335 |
Taxes receivable | 95 |  |  | 88 |
Prepaid expenses | 111 |  |  | 97 |
Other (1) | 79 |  |  | 82 |
Total | $ | 624 |  |  | $ | 602 |
(1)December 31, 2019 includes $4 million previously classified as “Receivables from the Divested Business”. Fixed Assets, net The components of Fixed assets, net are as follows (in millions):
As of December 31 | 2020 |  | 2019
Software | $ | 808 |  |  | $ | 727 |
Leasehold improvements | 375 |  |  | 358 |
Computer equipment | 249 |  |  | 250 |
Furniture, fixtures and equipment | 246 |  |  | 225 |
Construction in progress | 155 |  |  | 183 |
Other | 34 |  |  | 37 |
Fixed assets, gross | 1,867 |  |  | 1,780 |
Less: Accumulated depreciation | 1,268 |  |  | 1,159 |
Fixed assets, net | $ | 599 |  |  | $ | 621 |
Depreciation expense, which includes software amortization, was $167 million, $172 million, and $176 million for the years ended December 31, 2020, 2019, and 2018, respectively. Other Non-current Assets The components of Other non-current assets are as follows (in millions):
As of December 31 | 2020 |  | 2019
Costs to obtain contracts with customers | $ | 184 |  |  | $ | 171 |
Investments | 74 |  |  | 53 |
Leases | 89 |  |  | 100 |
Taxes receivable | 125 |  |  | 102 |
Other | 138 |  |  | 144 |
Total | $ | 610 |  |  | $ | 570 |
Other Current Liabilities The components of Other current liabilities are as follows (in millions):
As of December 31 | 2020 |  | 2019
Deferred revenue (1) | $ | 296 |  |  | $ | 270 |
Taxes payable | 80 |  |  | 93 |
Leases | 234 |  |  | 210 |
Other | 561 |  |  | 513 |
Total | $ | 1,171 |  |  | $ | 1,086 |
(1)$454 million and $532 million was recognized in the Consolidated Statements of Income during the twelve months ended December 31, 2020 and December 31, 2019, respectively. Other Non-current Liabilities The components of Other non-current liabilities are as follows (in millions):
As of December 31 | 2020 |  | 2019
Taxes payable (1) | $ | 561 |  |  | $ | 525 |
Leases | 65 |  |  | 76 |
Compensation and benefits | 53 |  |  | 49 |
Deferred revenue | 76 |  |  | 62 |
Other | 140 |  |  | 165 |
Total | $ | 895 |  |  | $ | 877 |
(1)Includes $145 million for the non-current portion of the Transition Tax, as of December 31, 2020 and December 31, 2019. Refer to Note 11 “Income Taxes” for further information on the Transition Tax.

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