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Other Financial Data | 12 Months Ended
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Dec. 31, 2014
Other Financial Data [Abstract] |
Other Financial Data | Other Financial Data Consolidated Statements of Income Information Other Income Other income consists of the following (in millions):
Years ended December 31 | 2014 |  | 2013 |  | 2012
Equity earnings | $ | 12 |  |  | $ | 20 |  |  | $ | 13 |
Gain on investments | 4 |  |  | 28 |  |  | 7 |
Gain on disposal of business | 24 |  |  | 10 |  |  | 1 |
Foreign currency remeasurement gain (loss) | 18 |  |  | 13 |  |  | (19 | )
Derivative (loss) gain | (19 | ) |  | (10 | ) |  | 3 |
Other | 5 |  |  | 7 |  |  | (3 | )
| $ | 44 |  |  | $ | 68 |  |  | $ | 2 |
Consolidated Statements of Financial Position Information Allowance for Doubtful Accounts An analysis of the allowance for doubtful accounts is as follows (in millions):
Years ended December 31, | 2014 |  | 2013 |  | 2012
Balance at beginning of year | $ | 90 |  |  | $ | 118 |  |  | $ | 104 |
Provision charged to operations | 12 |  |  | 9 |  |  | 45 |
Accounts written off, net of recoveries | (33 | ) |  | (38 | ) |  | (30 | )
Effect of exchange rate changes | 5 |  |  | 1 |  |  | (1 | )
Balance at end of year | $ | 74 |  |  | $ | 90 |  |  | $ | 118 |
Other Current Assets The components of Other current assets are as follows (in millions):
As of December 31 | 2014 |  | 2013
Taxes receivable | $ | 311 |  |  | $ | 204 |
Prepaid expenses | 164 |  |  | 229 |
Deferred project costs | 102 |  |  | 98 |
Other | 25 |  |  | 32 |
| $ | 602 |  |  | $ | 563 |
Fixed Assets, net The components of Fixed assets, net are as follows (in millions):
As of December 31 | 2014 |  | 2013
Software | $ | 1,020 |  |  | $ | 997 |
Leasehold improvements | 413 |  |  | 434 |
Computer equipment | 347 |  |  | 341 |
Furniture, fixtures and equipment | 313 |  |  | 323 |
Construction in progress | 94 |  |  | 70 |
Other | 124 |  |  | 124 |
| 2,311 |  |  | 2,289 |
Less: Accumulated depreciation | 1,546 |  |  | 1,498 |
Fixed assets, net | $ | 765 |  |  | $ | 791 |
Depreciation expense, which includes software amortization, was $242 million, $240 million, and $232 million for the years ended December 31, 2014, 2013, and 2012, respectively. Other Non-Current Assets The components of Other non-current assets are as follows (in millions):
As of December 31 | 2014 |  | 2013
Prepaid pension (1) | $ | 933 |  |  | $ | 567 |
Deferred project costs | 250 |  |  | 273 |
Taxes receivable | 101 |  |  | 108 |
Other | 233 |  |  | 282 |
| $ | 1,517 |  |  | $ | 1,230 |
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(1) | Increase in prepaid pensions is primarily due to actuarial changes and cash contributions made to the U.K. pension plans.
Other Current Liabilities The components of Other current liabilities are as follows (in millions):
As of December 31 | 2014 |  | 2013
Deferred revenue | $ | 408 |  |  | $ | 475 |
Taxes payable | 66 |  |  | 184 |
Other | 314 |  |  | 247 |
| $ | 788 |  |  | $ | 906 |
Other Non-Current Liabilities The components of Other non-current liabilities are as follows (in millions):
As of December 31 | 2014 |  | 2013
Taxes payable | $ | 210 |  |  | $ | 184 |
Leases | 184 |  |  | 204 |
Deferred revenue | 167 |  |  | 134 |
Compensation and benefits | 57 |  |  | 105 |
Other | 256 |  |  | 305 |
| $ | 874 |  |  | $ | 932 |

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