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Summary of Significant Accounting Policies - LIFO Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Accounting Policies [Line Items] |  |
LIFO inventory | $ 106 | $ 101
Cost of replacing inventories carried at LIFO cost less than carrying value | 8 |
CERC Corp |  |
Summary of Accounting Policies [Line Items] |  |
LIFO inventory | 86 | $ 82
Cost of replacing inventories carried at LIFO cost less than carrying value | $ 13 |

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- Definition Summary of Accounting Policies [Line Items] + References No definition available. + Details
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- Definition The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483489/210-10-50-1 + Details
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