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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Allowance for doubtful accounts |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 867 | $ 822 | $ 788
Charged to Costs and Expenses | 37 | 56 | 37
Charged to Other Accounts | 0 | (11) | (3)
Deductions | 0 | 0 | 0
Balance at End of Period | 904 | 867 | 822
Valuation allowance and reserves, current | 44 | 46 | 42
Environmental, litigation, tax and other reserves |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 3,164 | 2,429 | 2,411
Charged to Costs and Expenses | 714 | 900 | 115
Charged to Other Accounts | 138 | 94 | 43
Deductions | (304) | (259) | (140)
Balance at End of Period | 3,712 | 3,164 | 2,429
Environmental litigation tax and other reserves, current | $ 266 | $ 790 | $ 149

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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(Column B)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 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(Column E)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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