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Other Financial Data (Tables) | 6 Months Ended
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Jun. 30, 2018
Other Financial Data [Abstract] |
Schedule of Other Income (Expense) | Other income (expense) consists of the following (in millions):
| Three months ended June 30 |  | Six months ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Foreign currency remeasurement gain (loss) | $ | 29 |  |  | $ | (2 | ) |  | $ | 13 |  |  | $ | (12 | )
Loss on disposal of business | — |  |  | — |  |  | (1 | ) |  | (2 | )
Pension and other postretirement income (expense) | (7 | ) |  | 9 |  |  | (5 | ) |  | 17 |
Equity earnings | 1 |  |  | 3 |  |  | 2 |  |  | 9 |
Loss on financial instruments | (27 | ) |  | (6 | ) |  | (27 | ) |  | (10 | )
Other | 1 |  |  | — |  |  | — |  |  | — |
Total | $ | (3 | ) |  | $ | 4 |  |  | $ | (18 | ) |  | $ | 2 |
Schedule of Allowance for Doubtful Accounts | An analysis of the allowance for doubtful accounts are as follows (in millions):
| Three months ended June 30 |  | Six months ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Balance at beginning of period | $ | 65 |  |  | $ | 61 |  |  | $ | 59 |  |  | $ | 56 |
Provision charged to Other general expenses | 3 |  |  | 5 |  |  | 11 |  |  | 11 |
Accounts written off, net of recoveries | (6 | ) |  | (7 | ) |  | (8 | ) |  | (10 | )
Foreign currency translation and other | — |  |  | — |  |  | — |  |  | 2 |
Balance at end of period | $ | 62 |  |  | $ | 59 |  |  | $ | 62 |  |  | $ | 59 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of | June 30, 2018 |  | December 31, 2017
Taxes receivable | $ | 172 |  |  | $ | 114 |
Prepaid expenses | 120 |  |  | 126 |
Receivables from the Divested Business (1) | 10 |  |  | 28 |
Assets held for sale (2) | 47 |  |  | — |
Cost to fulfill contracts with customers (3) | 216 |  |  | — |
Other | 167 |  |  | 21 |
Total | $ | 732 |  |  | $ | 289 |
(1) | Refer to Note 4 “Discontinued Operations” for further information.
(2) | Refer to Note 7 “Acquisitions and Dispositions of Businesses” for further information.
(3) | Refer to Note 3 “Revenue from Contracts with Customers” for further information.
Schedule of Other Non-current Assets | The components of Other non-current assets are as follows (in millions):
As of | June 30, 2018 |  | December 31, 2017
Investments | $ | 54 |  |  | $ | 57 |
Taxes receivable | 77 |  |  | 84 |
Costs to obtain contracts with customers (1) | 144 |  |  | — |
Other | 129 |  |  | 166 |
Total | $ | 404 |  |  | $ | 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 | June 30, 2018 |  | December 31, 2017
Deferred revenue (1) | $ | 332 |  |  | $ | 311 |
Taxes payable (2) | 25 |  |  | 139 |
Liabilities held for sale (3) | 41 |  |  | — |
Other | 723 |  |  | 420 |
Total | $ | 1,121 |  |  | $ | 870 |
(1) | During the three and six months ended June 30, 2018, $115 million and $215 million, respectively, were 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 December 31, 2017. Refer to Note 11 “Income Taxes” for further information.
(3) | Refer to Note 7 “Acquisitions and Dispositions of Businesses” for further information.
Schedule of Other Non-current Liabilities | The components of Other non-current liabilities are as follows (in millions):
As of | June 30, 2018 |  | December 31, 2017
Taxes payable (1) | $ | 535 |  |  | $ | 529 |
Deferred revenue | 60 |  |  | 49 |
Leases | 152 |  |  | 153 |
Compensation and benefits | 60 |  |  | 67 |
Other | 281 |  |  | 304 |
Total | $ | 1,088 |  |  | $ | 1,102 |
(1) Includes provisional estimates of $213 million and $222 million for the non-current portion of the Transition Tax as of June 30, 2018 and December 31, 2017, respectively. Refer to Note 11 “Income Taxes” for further information.

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