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Other Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2015
Other Financial Data [Abstract] |
Other income (Expense) | Other income consists of the following (in millions):
Years ended December 31 | 2015 |  | 2014 |  | 2013
Equity earnings | $ | 13 |  |  | $ | 12 |  |  | $ | 20 |
Net gain on disposals of businesses | 82 |  |  | 24 |  |  | 10 |
Foreign currency remeasurement gain | 30 |  |  | 18 |  |  | 13 |
(Loss) income on financial instruments | (24 | ) |  | (15 | ) |  | 18 |
Other | (1 | ) |  | 5 |  |  | 7 |
| $ | 100 |  |  | $ | 44 |  |  | $ | 68 |
Schedule of Allowance for Doubtful Accounts | An analysis of the allowance for doubtful accounts is as follows (in millions):
Years ended December 31, | 2015 |  | 2014 |  | 2013
Balance at beginning of year | $ | 74 |  |  | $ | 90 |  |  | $ | 118 |
Provision charged to operations | 13 |  |  | 12 |  |  | 9 |
Accounts written off, net of recoveries | (34 | ) |  | (33 | ) |  | (38 | )
Foreign currency translation | 5 |  |  | 5 |  |  | 1 |
Balance at end of year | $ | 58 |  |  | $ | 74 |  |  | $ | 90 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of December 31 | 2015 |  | 2014
Taxes receivable | $ | 94 |  |  | $ | 99 |
Deferred tax assets | 232 |  |  | 212 |
Prepaid expenses | 130 |  |  | 164 |
Deferred project costs | 92 |  |  | 102 |
Other | 18 |  |  | 25 |
| $ | 566 |  |  | $ | 602 |
Components of Fixed assets, net | The components of Fixed assets, net are as follows (in millions):
As of December 31 | 2015 |  | 2014
Software | $ | 1,095 |  |  | $ | 1,020 |
Leasehold improvements | 422 |  |  | 413 |
Computer equipment | 358 |  |  | 347 |
Furniture, fixtures and equipment | 315 |  |  | 313 |
Construction in progress | 76 |  |  | 94 |
Other | 115 |  |  | 124 |
| 2,381 |  |  | 2,311 |
Less: Accumulated depreciation | 1,616 |  |  | 1,546 |
Fixed assets, net | $ | 765 |  |  | $ | 765 |
Schedule of Other Non-current Assets | The components of Other non-current assets are as follows (in millions):
As of December 31 | 2015 |  | 2014
Deferred project costs | 210 |  |  | 250 |
Investments | 135 |  |  | 143 |
Taxes receivable | 82 |  |  | 101 |
Other | 198 |  |  | 233 |
| $ | 625 |  |  | $ | 727 |
Schedule of Other Current Liabilities | The components of Other current liabilities are as follows (in millions):
As of December 31 | 2015 |  | 2014
Deferred revenue | $ | 394 |  |  | $ | 408 |
Taxes payable | 94 |  |  | 64 |
Deferred tax liability | 1 |  |  | 2 |
Other | 331 |  |  | 314 |
| $ | 820 |  |  | $ | 788 |
Schedule of Other Non-current Liabilities | The components of Other non-current liabilities are as follows (in millions):
As of December 31 | 2015 |  | 2014
Taxes payable | $ | 223 |  |  | $ | 210 |
Leases | 166 |  |  | 184 |
Deferred revenue | 159 |  |  | 167 |
Compensation and benefits | 59 |  |  | 57 |
Other | 162 |  |  | 256 |
| $ | 769 |  |  | $ | 874 |

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