v3.26.1
Nuclear Decommissioning Trust Funds - Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Cash equivalents, Amortized Cost $ 231 $ 689
Cash equivalents, Fair Value 9 16
Fair value of equity 389 385
Equity securities, Unrealized Gains 827 739
Equity securities, Unrealized Losses (20) (19)
Equity securities, Fair Value 1,196 1,105
Debt securities, Amortized Cost 791 773
Debt securities, Unrealized Gains 4 7
Debt securities, Unrealized Losses (9) (3)
Debt securities, Fair Value 786 777
Receivables (payables), net, Amortized Cost 6 2
Receivables (payables), net, Fair Value 6 2
Amortized Cost 1,195 1,176
Unrealized Gains 831 746
Unrealized Losses (29) (22)
NDT funds 1,997 1,900
Cash equivalents    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Cash equivalents, Amortized Cost 9 16
Cash equivalents, Fair Value $ 9 $ 16