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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II Valuation and Qualifying Accounts For the Years Ended December 31, 2023, 2022 and 2021
(In millions) Description | Balance at Beginning of Period |  | Additions Charged to Costs and Expenses |  | Deductions |  | Other |  | Balance at End of Period
Allowance for credit losses - receivables: |  |  |  |  |  |  |  |  |
2023 | $ | 11 |  |  | $ | 27 |  |  | $ | 23 |  |  | $ | 3 |  |  | $ | 18 |
2022 | 28 |  |  | 22 |  |  | 39 |  |  | — |  |  | 11 |
2021 | 78 |  |  | 3 |  |  | 53 |  |  | — |  |  | 28 |
Obsolescence allowance—spare parts: |  |  |  |  |  |  |  |  |
2023 | $ | 610 |  |  | $ | 102 |  |  | $ | 23 |  |  | $ | — |  |  | $ | 689 |
2022 | 546 |  |  | 73 |  |  | 9 |  |  | — |  |  | 610 |
2021 | 478 |  |  | 79 |  |  | 11 |  |  | — |  |  | 546 |
Allowance for credit losses - investments in affiliates and other: |  |  |  |  |  |  |  |  |
2023 | $ | 21 |  |  | $ | 20 |  |  | $ | — |  |  | $ | (3) |  |  | $ | 38 |
2022 | 622 |  |  | 20 |  |  | 539 |  |  | (82) |  |  | 21 |
2021 | 522 |  |  | 1 |  |  | — |  |  | 99 |  |  | 622 |
Valuation allowance for deferred tax assets: |  |  |  |  |  |  |  |  |
2023 | $ | 199 |  |  | $ | (21) |  |  | $ | — |  |  | $ | 1 |  |  | $ | 179 |
2022 | 210 |  |  | (10) |  |  | — |  |  | (1) |  |  | 199 |
2021 | 247 |  |  | (38) |  |  | — |  |  | 1 |  |  | 210 |

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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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- References No definition available. + Details
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