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Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for Bad Debts |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Jan. 1 |  | $ 122 | $ 106 | $ 79
Charged to costs and expenses |  | 79 | 73 | 60
Charged to other accounts | [1] | 13 | 26 | 14
Deductions from reserves | [2] | 86 | 83 | 47
Balance at Dec. 31 |  | 128 | 122 | 106
NOL and Tax Credit Valuation Allowances |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Jan. 1 |  | 62 | 64 | 64
Charged to costs and expenses |  | 26 | 6 | 5
Charged to other accounts |  | 0 | 0 | 0
Deductions from reserves | [3] | 18 | 8 | 5
Balance at Dec. 31 |  | $ 70 | $ 62 | $ 64
[1] | Recovery of amounts previously written-off.
[2] | Deductions related primarily to bad debt write-offs.
[3] | Primarily reversals of valuation allowances on completed tax credit sales and reductions of valuation allowances for items forecasted to be used prior to expiration

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 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(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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