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Debt and Credit Agreements - Summary of Bank Commitments, Credit Facility Borrowings and Available Capacity (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Jan. 31, 2025 | Dec. 31, 2024 | Nov. 30, 2024 | Jun. 30, 2024 | May 31, 2024
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | $ 9,458 |  | $ 8,958 |  |  |
Facility Draws | 0 |  | 0 |  |  |
Outstanding Letters of Credit | 2,185 |  | 2,173 |  |  |
Outstanding Commercial Paper | 0 |  | 0 |  |  |
Total Available Capacity | 7,237 |  | 6,742 |  |  |
Commercial Paper |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | 4,500 |  | 4,500 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | 4,500 |  | 4,500 |  | $ 4,500 | $ 3,500
Facility Draws | 0 |  | 0 |  |  |
Outstanding Letters of Credit | 50 |  | 51 |  |  |
Outstanding Commercial Paper | 0 |  | 0 |  |  |
Total Available Capacity | 4,450 |  | 4,449 |  |  |
Bilateral Credit Agreements |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | 2,350 |  | 1,850 |  |  |
Facility Draws | 0 |  | 0 |  |  |
Outstanding Letters of Credit | 1,117 |  | 1,095 |  |  |
Outstanding Commercial Paper | 0 |  | 0 |  |  |
Total Available Capacity | 1,233 |  | 755 |  |  |
Bilateral Credit Agreements | BilateralJan2025 |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment |  | $ 200 |  |  |  |
Bilateral Credit Agreements | BilateralMarch2025 |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | $ 300 |  |  |  |  |
Extended period term | 2 years |  |  |  |  |
Accounts Receivable Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | $ 1,500 |  | 1,500 | $ 1,100 |  |
Facility Draws | 0 |  | 0 |  |  |
Outstanding Letters of Credit | 0 |  | 0 |  |  |
Outstanding Commercial Paper | 0 |  | 0 |  |  |
Total Available Capacity | 1,500 |  | 1,500 |  |  |
Liquidity Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | 971 |  | 971 |  |  |
Facility Draws | 0 |  | 0 |  |  |
Outstanding Letters of Credit | 900 |  | 907 |  |  |
Outstanding Commercial Paper | 0 |  | 0 |  |  |
Total Available Capacity | 35 |  | 21 |  |  |
Liquidity Facility | No Additional Collateral Posted |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Outstanding Commercial Paper | 935 |  | 928 |  |  |
Secured debt |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Aggregate Bank Commitment | 137 |  | 137 |  |  |
Facility Draws | 0 |  | 0 |  |  |
Outstanding Letters of Credit | 118 |  | 120 |  |  |
Outstanding Commercial Paper | 0 |  | 0 |  |  |
Total Available Capacity | $ 19 |  | $ 17 |  |  |

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- Definition Line of Credit Facility, Extended Term Period + References No definition available. + Details
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Namespace Prefix: | ceg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for financing purchases of goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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