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Other Financial Data (Tables) | 3 Months Ended
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Mar. 31, 2018
Other Financial Data [Abstract] |
Schedule of Other Income (Expense) | Other income (expense) consists of the following (in millions):
| Three months ended March 31
| 2018 |  | 2017
Foreign currency remeasurement gain (loss) | $ | (16 | ) |  | $ | (10 | )
Loss on disposal of business | (1 | ) |  | (2 | )
Pension and other postretirement income | 2 |  |  | 8 |
Equity earnings (losses) | 1 |  |  | 6 |
Gain (loss) on financial instruments | — |  |  | (4 | )
Other | (1 | ) |  | — |
Total | $ | (15 | ) |  | $ | (2 | )
Schedule of Allowance for Doubtful Accounts | An analysis of the allowance for doubtful accounts are as follows (in millions):
| Three months ended March 31
| 2018 |  | 2017
Balance at beginning of period | $ | 59 |  |  | $ | 56 |
Provision charged to Other general expenses | 8 |  |  | 6 |
Accounts written off, net of recoveries | (3 | ) |  | (3 | )
Foreign currency translation | 1 |  |  | 2 |
Balance at end of period | $ | 65 |  |  | $ | 61 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of | March 31, 2018 |  | December 31, 2017
Taxes receivable | $ | 118 |  |  | $ | 114 |
Prepaid expenses | 142 |  |  | 126 |
Receivables from the Divested Business (1) | 6 |  |  | 28 |
Cost to fulfill contracts with customers (2) | 240 |  |  | — |
Other | 103 |  |  | 21 |
Total | $ | 609 |  |  | $ | 289 |
(1) | Refer to Note 4 “Discontinued Operations” for additional information.
(2) | Refer to Note 3 “Revenue from Contracts with Customers” for additional information.
Schedule of Other Non-current Assets | The components of Other non-current assets are as follows (in millions):
As of | March 31, 2018 |  | December 31, 2017
Investments | $ | 58 |  |  | $ | 57 |
Taxes receivable | 83 |  |  | 84 |
Cost to obtain contracts with customers (1) | 144 |  |  | — |
Other | 154 |  |  | 166 |
Total | $ | 439 |  |  | $ | 307 |
(1) | Refer to Note 3 “Revenue from Contracts with Customers” for additional information.
Schedule of Other Current Liabilities | The components of Other current liabilities are as follows (in millions):
As of | March 31, 2018 |  | December 31, 2017
Deferred revenue (1) | $ | 329 |  |  | $ | 311 |
Taxes payable (2) | 164 |  |  | 139 |
Other | 479 |  |  | 420 |
Total | $ | 972 |  |  | $ | 870 |
(1) | During the three months ended March 31, 2018, $100 million was recognized in the Condensed Consolidated Statement of Income.
(2) | Includes a provisional estimate of $42 million for the current portion of the Transition Tax as of March 31, 2018 and December 31, 2017.
Schedule of Other Non-current Liabilities | The components of Other non-current liabilities are as follows (in millions):
As of | March 31, 2018 |  | December 31, 2017
Taxes payable (1) | $ | 538 |  |  | $ | 529 |
Deferred revenue | 56 |  |  | 49 |
Leases | 156 |  |  | 153 |
Compensation and benefits | 62 |  |  | 67 |
Other | 293 |  |  | 304 |
Total | $ | 1,105 |  |  | $ | 1,102 |
(1) Includes a provisional estimate of $222 million for the non-current portion of the Transition Tax as of March 31, 2018 and December 31, 2017.

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