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Schedule II - Qualifying And Valuation Accounts | 12 Months Ended
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Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Qualifying And Valuation Accounts | SCHEDULE II – Qualifying and Valuation accounts for each of the three years in the period ended December 31, 2021
|  |  | Additions |  |  |  |  |  |
Valuation and Qualifying Accounts (in millions) | Balance at beginning of period |  | Acquisition |  | Charged to costs and expenses |  | (Credited) charged to other accounts (1) |  | Deductions |  | Balance at end of period
Year ended December 31, 2021: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 125 |  |  | 13 |  |  | (2) |  |  | (9) |  |  | (5) |  |  | $ | 122 |
Deferred tax asset valuation allowance | $ | 454 |  |  | 38 |  |  | 37 |  |  | (30) |  |  | (98) |  |  | $ | 401 |
Year ended December 31, 2020: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 112 |  |  | — |  |  | 11 |  |  | 6 |  |  | (4) |  |  | $ | 125 |
Deferred tax asset valuation allowance | $ | 420 |  |  | — |  |  | 77 |  |  | 26 |  |  | (69) |  |  | $ | 454 |
Year ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 110 |  |  | — |  |  | 12 |  |  | (2) |  |  | (8) |  |  | $ | 112 |
Deferred tax asset valuation allowance | $ | 310 |  |  | — |  |  | 117 |  |  | — |  |  | (7) |  |  | $ | 420 |
______________________________________ (1)Includes the adoption of a new accounting pronouncement as of January 1, 2020 and foreign currency translation adjustments. Reserves are deducted from assets to which they apply.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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