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Derivative Financial Instruments - Summary of Credit Risk Exposure (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2024 USD ($) counterparty
Derivative [Line Items] |
Cash collateral | $ 8
Letters of credit held | 55
Total Exposure Before Credit Collateral |
Derivative [Line Items] |
Maximum exposure | 1,062
Total Exposure Before Credit Collateral | Internally rated — investment grade |
Derivative [Line Items] |
Maximum exposure | 120
Total Exposure Before Credit Collateral | Internally rated — non-investment grade |
Derivative [Line Items] |
Maximum exposure | 207
Total Exposure Before Credit Collateral | Investment grade |
Derivative [Line Items] |
Maximum exposure | 722
Total Exposure Before Credit Collateral | Non-investment grade |
Derivative [Line Items] |
Maximum exposure | 13
Credit Collateral |
Derivative [Line Items] |
Maximum exposure | 63
Credit Collateral | Internally rated — investment grade |
Derivative [Line Items] |
Maximum exposure | 0
Credit Collateral | Internally rated — non-investment grade |
Derivative [Line Items] |
Maximum exposure | 43
Credit Collateral | Investment grade |
Derivative [Line Items] |
Maximum exposure | 17
Credit Collateral | Non-investment grade |
Derivative [Line Items] |
Maximum exposure | 3
Net Exposure |
Derivative [Line Items] |
Maximum exposure | 999
Net Exposure | Investor-owned utilities, marketers, power producers |
Derivative [Line Items] |
Maximum exposure | 733
Net Exposure | Energy cooperatives and municipalities |
Derivative [Line Items] |
Maximum exposure | 130
Net Exposure | Financial Institutions |
Derivative [Line Items] |
Maximum exposure | 48
Net Exposure | Other |
Derivative [Line Items] |
Maximum exposure | 88
Net Exposure | Internally rated — investment grade |
Derivative [Line Items] |
Maximum exposure | 120
Net Exposure | Internally rated — non-investment grade |
Derivative [Line Items] |
Maximum exposure | 164
Net Exposure | Investment grade |
Derivative [Line Items] |
Maximum exposure | 705
Net Exposure | Non-investment grade |
Derivative [Line Items] |
Maximum exposure | $ 10
Number of Counterparties Greater than 10% of Net Exposure |
Derivative [Line Items] |
Number of counterparties | counterparty | 0
Number of Counterparties Greater than 10% of Net Exposure | Internally rated — investment grade |
Derivative [Line Items] |
Number of counterparties | counterparty | 0
Number of Counterparties Greater than 10% of Net Exposure | Internally rated — non-investment grade |
Derivative [Line Items] |
Number of counterparties | counterparty | 0
Number of Counterparties Greater than 10% of Net Exposure | Investment grade |
Derivative [Line Items] |
Number of counterparties | counterparty | 0
Number of Counterparties Greater than 10% of Net Exposure | Non-investment grade |
Derivative [Line Items] |
Number of counterparties | counterparty | 0
Net Exposure of Counterparties Greater than 10% of Net Exposure |
Derivative [Line Items] |
Maximum exposure | $ 0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Internally rated — investment grade |
Derivative [Line Items] |
Maximum exposure | 0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Internally rated — non-investment grade |
Derivative [Line Items] |
Maximum exposure | 0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Investment grade |
Derivative [Line Items] |
Maximum exposure | 0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Non-investment grade |
Derivative [Line Items] |
Maximum exposure | $ 0

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- Definition Letters of credit held related to credit risk + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: 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(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: 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)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 + Details
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