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Other Financial Data | 12 Months Ended
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Dec. 31, 2018
Other Financial Data [Abstract] |
Other Financial Data | Other Financial Data Consolidated Statements of Income Information Other Income (Expense) Other income (expense) consists of the following (in millions):
| Years ended December 31
| 2018 |  | 2017 |  | 2016
Foreign currency remeasurement | $ | 25 |  |  | $ | (37 | ) |  | $ | (2 | )
Disposal of business | (6 | ) |  | (16 | ) |  | 39 |
Pension and other postretirement | 1 |  |  | (86 | ) |  | (173 | )
Equity earnings | 4 |  |  | 12 |  |  | 13 |
Financial instruments | (49 | ) |  | 2 |  |  | (14 | )
Total | $ | (25 | ) |  | $ | (125 | ) |  | $ | (137 | )
Consolidated Statements of Financial Position Information Allowance for Doubtful Accounts An analysis of the allowance for doubtful accounts is as follows (in millions):
| 2018 |  | 2017 |  | 2016
Balance at January 1 | $ | 59 |  |  | $ | 56 |  |  | $ | 58 |
Provision charged to Other general expenses | 24 |  |  | 18 |  |  | 10 |
Accounts written off, net of recoveries | (25 | ) |  | (18 | ) |  | (15 | )
Foreign currency translation | 4 |  |  | 3 |  |  | 3 |
Balance at December 31 | $ | 62 |  |  | $ | 59 |  |  | $ | 56 |
Other Current Assets The components of Other current assets are as follows (in millions):
As of December 31 | 2018 |  | 2017
Costs to fulfill contracts with customers (1) | $ | 329 |  |  | $ | — |
Taxes receivable | 113 |  |  | 114 |
Prepaid expenses | 97 |  |  | 126 |
Receivables from the Divested Business (2) | 12 |  |  | 28 |
Other | 67 |  |  | 21 |
Total | $ | 618 |  |  | $ | 289 |
(1) | Refer to Note 3 “Revenue from Contracts with Customers” for further information.
(2) | Refer to Note 5 “Discontinued Operations” for further information.
Fixed Assets, net The components of Fixed assets, net are as follows (in millions):
As of December 31 | 2018 |  | 2017
Software | $ | 693 |  |  | $ | 680 |
Leasehold improvements | 334 |  |  | 349 |
Computer equipment | 279 |  |  | 295 |
Furniture, fixtures and equipment | 228 |  |  | 240 |
Construction in progress | 154 |  |  | 79 |
Other | 45 |  |  | 90 |
Fixed assets, gross | 1,733 |  |  | 1,733 |
Less: Accumulated depreciation | 1,145 |  |  | 1,169 |
Fixed assets, net | $ | 588 |  |  | $ | 564 |
Depreciation expense, which includes software amortization, was $176 million, $187 million, and $162 million for the years ended December 31, 2018, 2017, and 2016, respectively. Other Non-Current Assets The components of Other non-current assets are as follows (in millions):
As of December 31 | 2018 |  | 2017
Costs to obtain contracts with customers (1) | $ | 156 |  |  | $ | — |
Investments | 54 |  |  | 57 |
Taxes receivable | 100 |  |  | 84 |
Other | 138 |  |  | 166 |
Total | $ | 448 |  |  | $ | 307 |
(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information. Other Current Liabilities The components of Other current liabilities are as follows (in millions):
As of December 31 | 2018 |  | 2017
Deferred revenue (1) | $ | 251 |  |  | $ | 311 |
Taxes payable (2) | 83 |  |  | 139 |
Other | 602 |  |  | 420 |
Total | $ | 936 |  |  | $ | 870 |
(1) | During the twelve months ended December 31, 2018, $487 million was recognized in the Consolidated Statements of Income.
(2) | Includes $42 million for the current portion of the Transition Tax as of December 31, 2017. Refer to Note 11 “Income Taxes” for further information on the Transition Tax.
Other Non-Current Liabilities The components of Other non-current liabilities are as follows (in millions):
As of December 31 | 2018 |  | 2017
Taxes payable (1) | $ | 585 |  |  | $ | 529 |
Leases | 169 |  |  | 153 |
Compensation and benefits | 56 |  |  | 67 |
Deferred revenue | 65 |  |  | 49 |
Other | 222 |  |  | 304 |
Total | $ | 1,097 |  |  | $ | 1,102 |
(1) | Includes $240 million and $222 million for the non-current portion of the Transition Tax, as of December 31, 2018 and December 31, 2017, respectively. Refer to Note 11 “Income Taxes” for further information on the Transition Tax.

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