v3.26.1
Nuclear Decommissioning Trust Funds - Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Cash equivalents, Amortized Cost $ 1,025 $ 689
Cash equivalents, Fair Value 16 16
Fair value of equity 388 385
Equity securities, Unrealized Gains 706 739
Equity securities, Unrealized Losses (22) (19)
Equity securities, Fair Value 1,072 1,105
Debt securities, Amortized Cost 780 773
Debt securities, Unrealized Gains 4 7
Debt securities, Unrealized Losses (9) (3)
Debt securities 775 777
Receivables (payables), net, Amortized Cost 6 2
Receivables (payables), net, Fair Value 6 2
Amortized Cost 1,190 1,176
Unrealized Gains 710 746
Unrealized Losses (31) (22)
NDT funds 1,869 1,900
Cash equivalents    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Cash equivalents, Amortized Cost 16 16
Cash equivalents, Fair Value $ 16 $ 16