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Other Financial Data | 3 Months Ended
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Mar. 31, 2014
Other Financial Data [Abstract] |
Other Financial Data | Other Financial Data Condensed Consolidated Statements of Income Information Other Income Other income consists of the following (in millions):
| Three months ended March 31,
| 2014 |  | 2013
Equity earnings | $ | 5 |  |  | $ | 2 |
(Loss) gain on investments | (1 | ) |  | 1 |
Foreign currency remeasurement gain | 19 |  |  | 24 |
Derivative loss | (23 | ) |  | (18 | )
Other | 1 |  |  | — |
| $ | 1 |  |  | $ | 9 |
Condensed Consolidated Statements of Financial Position Information Allowance for Doubtful Accounts An analysis of the allowance for doubtful accounts is as follows (in millions):
| Three months ended March 31,
| 2014 |  | 2013
Balance at beginning of period | $ | 90 |  |  | $ | 118 |
Provision charged to operations | 4 |  |  | 10 |
Accounts written off, net of recoveries | (5 | ) |  | (9 | )
Effect of exchange rate changes and other | — |  |  | 3 |
Balance at end of period | $ | 89 |  |  | $ | 122 |
Other Current Assets The components of Other current assets are as follows (in millions):
| Mar 31, 2014 |  | Dec 31, 2013
Prepaid expenses | $ | 219 |  |  | $ | 229 |
Taxes receivable | 130 |  |  | 111 |
Deferred project costs | 102 |  |  | 98 |
Deferred tax assets | 81 |  |  | 93 |
Other | 45 |  |  | 32 |
| $ | 577 |  |  | $ | 563 |
Other Non-Current Assets The components of Other non-current assets are as follows (in millions):
| Mar 31, 2014 |  | Dec 31, 2013
Prepaid pension (1) | $ | 659 |  |  | $ | 567 |
Deferred project costs | 259 |  |  | 273 |
Deferred tax assets | 180 |  |  | 193 |
Taxes receivable | 100 |  |  | 108 |
Other | 248 |  |  | 282 |
| $ | 1,446 |  |  | $ | 1,423 |
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(1) | Increase in prepaid pensions is primarily due to cash funding of the U.K. pension plans.
Other Current Liabilities The components of Other current liabilities are as follows (in millions):
| Mar 31, 2014 |  | Dec 31, 2013
Deferred revenue | $ | 513 |  |  | $ | 475 |
Taxes payable | 140 |  |  | 136 |
Deferred tax liabilities | 53 |  |  | 48 |
Other | 261 |  |  | 247 |
| $ | 967 |  |  | $ | 906 |
Other Non-Current Liabilities The components of Other non-current liabilities are as follows (in millions):
| Mar 31, 2014 |  | Dec 31, 2013
Deferred tax liabilities | $ | 365 |  |  | $ | 420 |
Leases | 201 |  |  | 204 |
Taxes payable | 194 |  |  | 184 |
Deferred revenue | 128 |  |  | 134 |
Compensation and benefits | 59 |  |  | 105 |
Other | 301 |  |  | 305 |
| $ | 1,248 |  |  | $ | 1,352 |

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