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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Allowance for doubtful accounts |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | $ 123 | $ 150 | $ 126 | [1]
Additions, charged (credited) to income |  | 16 | 5 | 30 |
Additions, charged (credited) to AOCL |  | 0 | 0 | 0 |
Deductions from reserves | [2] | (22) | (24) | (11) |
Translation adjustment during period |  | (5) | (8) | 5 |
Balance at end of period |  | 112 | 123 | 150 |
Valuation allowance — deferred tax assets |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | 1,044 | 1,469 | 982 |
Additions, charged (credited) to income |  | 35 | (418) | 488 |
Additions, charged (credited) to AOCL |  | (7) | (7) | (1) |
Deductions from reserves | [2] | 0 | 0 | 0 |
Translation adjustment during period |  | 0 | 0 | 0 |
Balance at end of period |  | $ 1,072 | $ 1,044 | $ 1,469 |
[1] | Effective January 1, 2020, we adopted, using the modified retrospective adoption approach, an accounting standards update with new guidance relating to credit losses on financial instruments. Our adoption of this standards update resulted in a cumulative effect adjustment to decrease Retained Earnings by $12 million, with Accounts Receivables decreasing by $15 million and Deferred Income Taxes increasing by $3 million.
[2] | Accounts receivable charged off.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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