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Non-Derivative Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Nuclear decommissinoning fund [Abstract]    
Equity investments in unconsolidated subsidiaries $ 228 $ 219
Miscellaneous investments   133
Debt Securities, Available-for-sale, Unrealized Gain 1,000  
Debt Securities, Available-for-sale, Unrealized Loss 61 90
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less 1  
Due in 1 to 5 years 220  
Due in 5 to 10 years 254  
Due after 10 years 239  
Total 714  
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-sale, Unrealized Gain 1,000  
Debt Securities, Available-for-sale, Unrealized Loss 61 90
Interest Rate Swap    
Nuclear decommissinoning fund [Abstract]    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 2  
Fair Value Measured on a Recurring Basis | Cost    
Nuclear decommissinoning fund [Abstract]    
Decommissioning Fund Investments 2,045 [1] 1,976 [2]
Fair Value Measured on a Recurring Basis | Cost | Cash equivalents    
Nuclear decommissinoning fund [Abstract]    
Cash equivalents 44 [1] 29 [2]
Fair Value Measured on a Recurring Basis | Cost | Commingled funds    
Nuclear decommissinoning fund [Abstract]    
Commingled funds [2]   803
Investments, Fair Value Disclosure [1] 743  
Fair Value Measured on a Recurring Basis | Cost | Debt securities    
Nuclear decommissinoning fund [Abstract]    
Debt securities 751 [1] 738 [2]
Fair Value Measured on a Recurring Basis | Cost | Equity securities    
Nuclear decommissinoning fund [Abstract]    
Equity Securities, FV-NI 507 [1] 406 [2]
Fair Value Measured on a Recurring Basis | Fair Value    
Nuclear decommissinoning fund [Abstract]    
Alternative investment 1,076 [1] 1,178 [2]
Decommissioning Fund Investments 3,008 [1] 2,882 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Cash equivalents    
Nuclear decommissinoning fund [Abstract]    
Cash equivalents 44 [1] 29 [2]
Alternative investment 0 [1] 0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Commingled funds    
Nuclear decommissinoning fund [Abstract]    
Commingled funds   1,178
Alternative investment 1,076 [1] 1,178 [2]
Investments, Fair Value Disclosure 1,076  
Fair Value Measured on a Recurring Basis | Fair Value | Debt securities    
Nuclear decommissinoning fund [Abstract]    
Debt securities 714 [1] 675 [2]
Alternative investment 0 [1] 0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Equity securities    
Nuclear decommissinoning fund [Abstract]    
Equity Securities, FV-NI 1,174 [1] 1,000 [2]
Alternative investment 0 [1] 0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1    
Nuclear decommissinoning fund [Abstract]    
Decommissioning Fund Investments 1,216 [1] 1,028 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Cash equivalents    
Nuclear decommissinoning fund [Abstract]    
Cash equivalents 44 [1] 29 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Commingled funds    
Nuclear decommissinoning fund [Abstract]    
Commingled funds [2]   0
Investments, Fair Value Disclosure [1] 0  
Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Debt securities    
Nuclear decommissinoning fund [Abstract]    
Debt securities 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 1,172 [1] 999 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2    
Nuclear decommissinoning fund [Abstract]    
Decommissioning Fund Investments 709 [1] 670 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Cash equivalents    
Nuclear decommissinoning fund [Abstract]    
Cash equivalents 0 [1] 0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Commingled funds    
Nuclear decommissinoning fund [Abstract]    
Commingled funds [2]   0
Investments, Fair Value Disclosure [1] 0  
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Debt securities    
Nuclear decommissinoning fund [Abstract]    
Debt securities 707 [1] 669 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Equity securities    
Nuclear decommissinoning fund [Abstract]    
Equity Securities, FV-NI 2 [1] 1 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3    
Nuclear decommissinoning fund [Abstract]    
Decommissioning Fund Investments 7 [1] 6 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Cash equivalents    
Nuclear decommissinoning fund [Abstract]    
Cash equivalents 0 [1] 0 [2]
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Commingled funds    
Nuclear decommissinoning fund [Abstract]    
Commingled funds [2]   0
Investments, Fair Value Disclosure [1] 0  
Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Debt securities    
Nuclear decommissinoning fund [Abstract]    
Debt securities 7 [1] 6 [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 [2]
[1] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $228 million of equity method investments and $137 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 $219 million of equity investments in unconsolidated subsidiaries and $133 million of rabbi trust assets and other miscellaneous investments.