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Schedule II | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure |
Description (in millions) | Balance at Beginning of Year |  |  |  | Credit loss exposure(1) |  | Write-offs(2) |  |  |  | Balance at End of Year
Year Ended December 31, 2023: |  |  |  |  |  |  |  |  |  |  |
Allowances for credit losses | $ | 109 |  |  |  |  | 50 |  |  | (48) |  |  |  |  | $ | 110 |
Year Ended December 31, 2022: |  |  |  |  |  |  |  |  |  |  |
Allowances for credit losses | $ | 108 |  |  |  |  | 35 |  |  | (35) |  |  |  |  | $ | 109 |
Year Ended December 31, 2021: |  |  |  |  |  |  |  |  |  |  |
Allowances for credit losses | $ | 105 |  |  |  |  | 28 |  |  | (25) |  |  |  |  | $ | 108 |
(1) We record credit loss reserves to Allowance for credit losses when we establish Trade accounts receivable if credit losses are expected over the asset's contractual life. Subsequent credit loss reserves are recorded when deemed uncollectible. Amounts shown within credit loss exposure above were established through selling, general and administrative expense. (2) Represents actual write-offs of uncollectible accounts.

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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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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