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Other Financial Data (Tables) | 6 Months Ended
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Jun. 30, 2019
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
| 2019 |  | 2018 |  | 2019 |  | 2018
Foreign currency remeasurement | $ | 11 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 13 |
Disposal of businesses | 2 |  |  | — |  |  | 7 |  |  | (1 | )
Pension and other postretirement | 5 |  |  | (7 | ) |  | 9 |  |  | (5 | )
Equity earnings | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
Financial instruments | (13 | ) |  | (27 | ) |  | (12 | ) |  | (27 | )
Other | — |  |  | 1 |  |  | — |  |  | — |
Total | $ | 6 |  |  | $ | (3 | ) |  | $ | 6 |  |  | $ | (18 | )
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
| 2019 |  | 2018 |  | 2019 |  | 2018
Balance at beginning of period | $ | 64 |  |  | $ | 65 |  |  | $ | 64 |  |  | $ | 59 |
Provision charged to Other general expenses | 4 |  |  | 3 |  |  | 12 |  |  | 11 |
Accounts written off, net of recoveries | (3 | ) |  | (6 | ) |  | (11 | ) |  | (8 | )
Balance at end of period | $ | 65 |  |  | $ | 62 |  |  | $ | 65 |  |  | $ | 62 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of | June 30, 2019 |  | December 31, 2018
Costs to fulfill contracts with customers (1) | $ | 216 |  |  | $ | 329 |
Prepaid expenses | 128 |  |  | 97 |
Taxes receivable | 145 |  |  | 113 |
Other (2) | 142 |  |  | 79 |
Total | $ | 631 |  |  | $ | 618 |
(1) | Refer to Note 3 “Revenue from Contracts with Customers” for further information.
(2) December 31, 2018 includes $12 million previously classified as “Receivables from the Divested Business
Schedule of Other Non-current Assets | The components of Other non-current assets are as follows (in millions):
As of | June 30, 2019 |  | December 31, 2018
Costs to obtain contracts with customers (1) | $ | 161 |  |  | $ | 156 |
Taxes receivable | 100 |  |  | 100 |
Leases (2) | 65 |  |  | — |
Investments | 54 |  |  | 54 |
Other | 141 |  |  | 138 |
Total | $ | 521 |  |  | $ | 448 |
(1) | Refer to Note 3 “Revenue from Contracts with Customers” for further information.
(2) Refer to Note 20 “Lease Commitments” for further information.
Schedule of Other Current Liabilities | The components of Other current liabilities are as follows (in millions):
As of | June 30, 2019 |  | December 31, 2018
Deferred revenue (1) | $ | 337 |  |  | $ | 251 |
Leases (2) | 223 |  |  | — |
Taxes payable | 133 |  |  | 83 |
Other | 504 |  |  | 602 |
Total | $ | 1,197 |  |  | $ | 936 |
(1) | During the three and six months ended June 30, 2019, $95 million and $241 million, respectively, was recognized in the Condensed Consolidated Statements of Income. During the three and six months ended June 30, 2018, $115 million and $215 million, respectively, was recognized in the Condensed Consolidated Statements of Income.
(2) | Refer to Note 20 “Lease Commitments” 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, 2019 |  | December 31, 2018
Taxes payable (1) | $ | 576 |  |  | $ | 585 |
Leases | 37 |  |  | 169 |
Deferred revenue | 59 |  |  | 65 |
Compensation and benefits | 49 |  |  | 56 |
Other | 203 |  |  | 222 |
Total | $ | 924 |  |  | $ | 1,097 |
(1) Includes $221 million and $240 million for the non-current portion of the one-time mandatory transition tax on accumulated foreign earnings as of June 30, 2019 and December 31, 2018, respectively.

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