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Other Financial Data (Tables) | 9 Months Ended
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Sep. 30, 2018
Other Financial Data [Abstract] |
Schedule of Other Income (Expense) | Other income (expense) consists of the following (in millions):
| Three months ended September 30 |  | Nine months ended September 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Foreign currency remeasurement gain (loss) | $ | 3 |  |  | $ | (20 | ) |  | $ | 16 |  |  | $ | (32 | )
Gain (loss) on disposal of business | (3 | ) |  | — |  |  | (4 | ) |  | (2 | )
Pension and other postretirement income (expense) | — |  |  | 9 |  |  | (5 | ) |  | 26 |
Equity earnings | 1 |  |  | 2 |  |  | 3 |  |  | 11 |
Gain (loss) on financial instruments | — |  |  | 16 |  |  | (27 | ) |  | 6 |
Other | — |  |  | (3 | ) |  | — |  |  | (3 | )
Total | $ | 1 |  |  | $ | 4 |  |  | $ | (17 | ) |  | $ | 6 |
Schedule of Allowance for Doubtful Accounts | An analysis of the allowance for doubtful accounts are as follows (in millions):
| Three months ended September 30 |  | Nine months ended September 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Balance at beginning of period | $ | 62 |  |  | $ | 59 |  |  | $ | 59 |  |  | $ | 56 |
Provision charged to Other general expenses | 9 |  |  | 5 |  |  | 21 |  |  | 16 |
Accounts written off, net of recoveries | (8 | ) |  | — |  |  | (17 | ) |  | (10 | )
Foreign currency translation and other | 3 |  |  | (5 | ) |  | 3 |  |  | (3 | )
Balance at end of period | $ | 66 |  |  | $ | 59 |  |  | $ | 66 |  |  | $ | 59 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of | September 30, 2018 |  | December 31, 2017
Costs to fulfill contracts with customers (1) | $ | 248 |  |  | $ | — |
Taxes receivable | 196 |  |  | 114 |
Prepaid expenses | 109 |  |  | 126 |
Receivables from the Divested Business (2) | 11 |  |  | 28 |
Other | 163 |  |  | 21 |
Total | $ | 727 |  |  | $ | 289 |
(1) | Refer to Note 3 “Revenue from Contracts with Customers” for further information.
(2) | Refer to Note 4 “Discontinued Operations” for further information.
Schedule of Other Non-current Assets | The components of Other non-current assets are as follows (in millions):
As of | September 30, 2018 |  | December 31, 2017
Costs to obtain contracts with customers (1) | $ | 150 |  |  | $ | — |
Investments | 52 |  |  | 57 |
Taxes receivable | 75 |  |  | 84 |
Other | 157 |  |  | 166 |
Total | $ | 434 |  |  | $ | 307 |
(1) | Refer to Note 3 “Revenue from Contracts with Customers” for further information.
Schedule of Other Current Liabilities | The components of Other current liabilities are as follows (in millions):
As of | September 30, 2018 |  | December 31, 2017
Deferred revenue (1) | $ | 266 |  |  | $ | 311 |
Taxes payable (2) | 16 |  |  | 139 |
Other | 706 |  |  | 420 |
Total | $ | 988 |  |  | $ | 870 |
(1) | During the three and nine months ended September 30, 2018, $133 million and $348 million, respectively, were recognized in the Condensed Consolidated Statements of Income.
(2) | Includes a provisional estimate of $42 million for the current portion of the Transition Tax as of December 31, 2017. Refer to Note 11 “Income Taxes” for further information.
Schedule of Other Non-current Liabilities | The components of Other non-current liabilities are as follows (in millions):
As of | September 30, 2018 |  | December 31, 2017
Taxes payable (1) | $ | 563 |  |  | $ | 529 |
Deferred revenue | 52 |  |  | 49 |
Leases | 157 |  |  | 153 |
Compensation and benefits | 60 |  |  | 67 |
Other | 258 |  |  | 304 |
Total | $ | 1,090 |  |  | $ | 1,102 |
(1) Includes provisional estimates of $235 million and $222 million for the non-current portion of the Transition Tax as of September 30, 2018 and December 31, 2017, respectively. Refer to Note 11 “Income Taxes” for further information.

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