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Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
SNF Obligation	$ 1,349	$ 1,296
Carrying Amount
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	8,412	7,617
SNF Obligation	1,349	1,296
Fair Value
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	8,942	7,914
SNF Obligation	1,310	1,222
Fair Value | Level 2
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	8,205	7,140
SNF Obligation	1,310	1,222
Fair Value | Level 3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	737	774
SNF Obligation	$ 0	$ 0

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Provision for the disposal costs of spent nuclear fuel from generating stations.

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No definition available.

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