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Other Financial Data (Tables) | 6 Months Ended
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Jun. 30, 2021
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,
| 2021 |  | 2020 (1) |  | 2021 |  | 2020 (1)
Foreign currency remeasurement | $ | (13) |  |  | $ | (2) |  |  | $ | (9) |  |  | $ | 40 |
Pension and other postretirement | 8 |  |  | 2 |  |  | 14 |  |  | 6 |
Equity earnings | 3 |  |  | 1 |  |  | 4 |  |  | 2 |
Extinguishment of debt | — |  |  | (7) |  |  | — |  |  | (7) |
Disposal of businesses | 1 |  |  | — |  |  | 1 |  |  | 25 |
Financial instruments and other | — |  |  | (3) |  |  | (13) |  |  | (47) |
Total | $ | (1) |  |  | $ | (9) |  |  | $ | (3) |  |  | $ | 19 |
(1)For the three months ended June 30, 2020 the Company has included $1 million of income that was previously classified as Net income from discontinued operations. There was no impact on the six months ended June 30, 2020. Refer to Note 1 “Basis of Presentation” for further information.
Schedule of Allowance for Doubtful Accounts | An analysis of the allowance for doubtful accounts is as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | $ | 101 |  |  | $ | 81 |  |  | $ | 98 |  |  | $ | 77 |
Provision | 21 |  |  | 6 |  |  | 27 |  |  | 15 |
Accounts written off, net of recoveries | (19) |  |  | (3) |  |  | (23) |  |  | (11) |
Foreign currency translation and other | (1) |  |  | — |  |  | — |  |  | 3 |
Balance at end of period | $ | 102 |  |  | $ | 84 |  |  | $ | 102 |  |  | $ | 84 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of | June 30, 2021 |  | December 31, 2020
Costs to fulfill contracts with customers (1) | $ | 222 |  |  | $ | 339 |
Prepaid expenses | 136 |  |  | 111 |
Taxes receivable | 85 |  |  | 95 |
Other | 104 |  |  | 79 |
Total | $ | 547 |  |  | $ | 624 |
(1)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, 2021 |  | December 31, 2020
Costs to obtain contracts with customers (1) | $ | 175 |  |  | $ | 184 |
Taxes receivable | 98 |  |  | 125 |
Leases | 76 |  |  | 89 |
Investments | 78 |  |  | 74 |
Other | 119 |  |  | 138 |
Total | $ | 546 |  |  | $ | 610 |
(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, 2021 |  | December 31, 2020
Deferred revenue (1) | $ | 355 |  |  | $ | 296 |
Taxes payable | 100 |  |  | 80 |
Leases | 228 |  |  | 234 |
Other | 735 |  |  | 561 |
Total | $ | 1,418 |  |  | $ | 1,171 |
(1)During the three and six months ended June 30, 2021, revenue of $173 million and $344 million, respectively, was recognized in the Condensed Consolidated Statements of Income. During the three and six months ended June 30, 2020, revenue of $171 million and $288 million, respectively, was recognized in the Condensed Consolidated Statements of Income.
Schedule of Other Non-current Liabilities | The components of Other non-current liabilities are as follows (in millions):
As of | June 30, 2021 |  | December 31, 2020
Taxes payable (1) | $ | 586 |  |  | $ | 561 |
Leases | 55 |  |  | 65 |
Deferred revenue | 68 |  |  | 76 |
Compensation and benefits | 75 |  |  | 53 |
Other | 128 |  |  | 140 |
Total | $ | 912 |  |  | $ | 895 |
(1)Includes $145 million for the non-current portion of the one-time mandatory transition tax on accumulated foreign earnings as of June 30, 2021 and December 31, 2020.

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