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Other Financial Data | 12 Months Ended
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Dec. 31, 2017
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 | 2017 |  | 2016 |  | 2015
Foreign currency remeasurement gain (loss) | $ | (37 | ) |  | $ | (2 | ) |  | $ | 30 |
Net gain (loss) on disposal of businesses | (16 | ) |  | 39 |  |  | 82 |
Equity earnings | 12 |  |  | 13 |  |  | 13 |
Income (loss) on financial instruments | 2 |  |  | (14 | ) |  | (24 | )
Other | — |  |  | — |  |  | (1 | )
Total | $ | (39 | ) |  | $ | 36 |  |  | $ | 100 |
Consolidated Statements of Financial Position Information Allowance for Doubtful Accounts An analysis of the allowance for doubtful accounts is as follows (in millions):
| 2017 |  | 2016 |  | 2015
Balance at January 1 | $ | 56 |  |  | $ | 58 |  |  | $ | 72 |
Provision charged to Other general expenses | 18 |  |  | 10 |  |  | 12 |
Accounts written off, net of recoveries | (18 | ) |  | (15 | ) |  | (32 | )
Foreign currency translation | 3 |  |  | 3 |  |  | 6 |
Balance at December 31 | $ | 59 |  |  | $ | 56 |  |  | $ | 58 |
Other Current Assets The components of Other current assets are as follows (in millions):
As of December 31 | 2017 |  | 2016
Taxes receivable | $ | 114 |  |  | $ | 100 |
Prepaid expenses | 126 |  |  | 102 |
Receivables from the Divested Business (1) | 28 |  |  | — |
Other | 21 |  |  | 45 |
Total | $ | 289 |  |  | $ | 247 |
(1) | Refer to Note 4 “Discontinued Operations” for additional information.
Fixed Assets, net The components of Fixed assets, net are as follows (in millions):
As of December 31 | 2017 |  | 2016
Software | $ | 680 |  |  | $ | 677 |
Leasehold improvements | 349 |  |  | 369 |
Computer equipment | 295 |  |  | 258 |
Furniture, fixtures and equipment | 240 |  |  | 252 |
Construction in progress | 79 |  |  | 75 |
Other | 90 |  |  | 115 |
Fixed assets, gross | 1,733 |  |  | 1,746 |
Less: Accumulated depreciation | 1,169 |  |  | 1,196 |
Fixed assets, net | $ | 564 |  |  | $ | 550 |
Depreciation expense, which includes software amortization, was $187 million, $162 million, and $164 million for the years ended December 31, 2017, 2016, and 2015, respectively. Other Non-Current Assets The components of Other non-current assets are as follows (in millions):
As of December 31 | 2017 |  | 2016
Investments | $ | 57 |  |  | $ | 119 |
Taxes receivable | 84 |  |  | 82 |
Other | 166 |  |  | 159 |
Total | $ | 307 |  |  | $ | 360 |
Other Current Liabilities The components of Other current liabilities are as follows (in millions):
As of December 31 | 2017 |  | 2016
Deferred revenue | $ | 311 |  |  | $ | 199 |
Taxes payable (1) | 139 |  |  | 77 |
Other | 420 |  |  | 380 |
Total | $ | 870 |  |  | $ | 656 |
(1) | Includes a provisional estimate of $42 million for the current portion of the Transition Tax. Refer to Note 10 “Income Taxes” for further information.
Other Non-Current Liabilities The components of Other non-current liabilities are as follows (in millions):
| 2017 |  | 2016
Taxes payable (1) | $ | 529 |  |  | $ | 288 |
Leases | 153 |  |  | 136 |
Compensation and benefits | 67 |  |  | 56 |
Deferred revenue | 49 |  |  | 49 |
Other | 304 |  |  | 190 |
Total | $ | 1,102 |  |  | $ | 719 |
(1) | Includes a provisional estimate of $222 million for the Transition Tax. Refer to Note 10 “Income Taxes” for further information.

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