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Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
SNF Obligation	$ 1,381	$ 1,366
Carrying Amount
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	8,358	8,412
SNF Obligation	1,381	1,366
Fair Value
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	8,481	8,521
SNF Obligation	1,284	1,278
Fair Value | Level 2
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	7,781	7,805
SNF Obligation	1,284	1,278
Fair Value | Level 3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	700	716
SNF Obligation	$ 0	$ 0

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- 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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