XML 57 R46.htm IDEA: XBRL DOCUMENT v3.24.3
Non-Derivative Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Nuclear decommissinoning fund [Abstract]          
Equity investments in unconsolidated subsidiaries $ 247   $ 247   $ 244
Miscellaneous investments 159   159   144
Debt Securities, Available-for-sale, Unrealized Gain     1,400   1,200
Debt Securities, Available-for-sale, Unrealized Loss     23   29
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0 $ 0 0 $ 0  
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]          
Due in one year or less 9   9    
Due in 1 to 5 years 303   303    
Due in 5 to 10 years 277   277    
Due after 10 years 276   276    
Total 865   865    
Debt Securities, Available-for-sale, Unrealized Gain     1,400   1,200
Debt Securities, Available-for-sale, Unrealized Loss     23   29
Interest Rate Swap          
Nuclear decommissinoning fund [Abstract]          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 1   1    
Fair Value Measured on a Recurring Basis | Cost          
Nuclear decommissinoning fund [Abstract]          
Decommissioning Fund Investments 2,124 [1]   2,124 [1]   2,054 [2]
Fair Value Measured on a Recurring Basis | Cost | Cash equivalents          
Nuclear decommissinoning fund [Abstract]          
Cash equivalents 42 [1]   42 [1]   41 [2]
Fair Value Measured on a Recurring Basis | Cost | Commingled funds          
Nuclear decommissinoning fund [Abstract]          
Alternative investment [2]         721
Investments, Fair Value Disclosure [1] 711   711    
Fair Value Measured on a Recurring Basis | Cost | Debt securities          
Nuclear decommissinoning fund [Abstract]          
Debt securities 850 [1]   850 [1]   784 [2]
Fair Value Measured on a Recurring Basis | Cost | Equity securities          
Nuclear decommissinoning fund [Abstract]          
Equity Securities, FV-NI 521 [1]   521 [1]   508 [2]
Fair Value Measured on a Recurring Basis | Fair Value          
Nuclear decommissinoning fund [Abstract]          
Alternative investment 1,046 [1]   1,046 [1]   1,049 [2]
Decommissioning Fund Investments 3,541 [1]   3,541 [1]   3,211 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Cash equivalents          
Nuclear decommissinoning fund [Abstract]          
Cash equivalents 42 [1]   42 [1]   41 [2]
Alternative investment 0 [1]   0 [1]   0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Commingled funds          
Nuclear decommissinoning fund [Abstract]          
Alternative investment 1,046 [1]   1,046 [1]   1,049 [2]
Investments, Fair Value Disclosure 1,046   1,046    
Fair Value Measured on a Recurring Basis | Fair Value | Debt securities          
Nuclear decommissinoning fund [Abstract]          
Debt securities 865 [1]   865 [1]   780 [2]
Alternative investment 0 [1]   0 [1]   0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Equity securities          
Nuclear decommissinoning fund [Abstract]          
Equity Securities, FV-NI 1,588 [1]   1,588 [1]   1,341 [2]
Alternative investment 0 [1]   0 [1]   0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1          
Nuclear decommissinoning fund [Abstract]          
Decommissioning Fund Investments 1,628 [1]   1,628 [1]   1,380 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Cash equivalents          
Nuclear decommissinoning fund [Abstract]          
Cash equivalents 42 [1]   42 [1]   41 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Commingled funds          
Nuclear decommissinoning fund [Abstract]          
Alternative investment [2]         0
Investments, Fair Value Disclosure [1] 0   0    
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Debt securities          
Nuclear decommissinoning fund [Abstract]          
Debt securities 0 [1]   0 [1]   0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Equity securities          
Nuclear decommissinoning fund [Abstract]          
Equity Securities, FV-NI 1,586 [1]   1,586 [1]   1,339 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2          
Nuclear decommissinoning fund [Abstract]          
Decommissioning Fund Investments 850 [1]   850 [1]   773 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Cash equivalents          
Nuclear decommissinoning fund [Abstract]          
Cash equivalents 0 [1]   0 [1]   0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Commingled funds          
Nuclear decommissinoning fund [Abstract]          
Alternative investment [2]         0
Investments, Fair Value Disclosure [1] 0   0    
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Debt securities          
Nuclear decommissinoning fund [Abstract]          
Debt securities 848 [1]   848 [1]   771 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Equity securities          
Nuclear decommissinoning fund [Abstract]          
Equity Securities, FV-NI 2 [1]   2 [1]   2 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3          
Nuclear decommissinoning fund [Abstract]          
Decommissioning Fund Investments 17 [1]   17 [1]   9 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Cash equivalents          
Nuclear decommissinoning fund [Abstract]          
Cash equivalents 0 [1]   0 [1]   0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Commingled funds          
Nuclear decommissinoning fund [Abstract]          
Alternative investment [2]         0
Investments, Fair Value Disclosure [1] 0   0    
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Debt securities          
Nuclear decommissinoning fund [Abstract]          
Debt securities 17 [1]   17 [1]   9 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Equity securities          
Nuclear decommissinoning fund [Abstract]          
Equity Securities, FV-NI $ 0 [1]   $ 0 [1]   $ 0 [2]
[1] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $247 million of equity method investments and $159 million of rabbi trust assets and other miscellaneous investments.
[2] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $244 million of equity investments in unconsolidated subsidiaries and $144 million of rabbi trust assets and other miscellaneous investments.