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Non-Derivative Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Nuclear decommissinoning fund [Abstract]      
Equity investments in unconsolidated subsidiaries   $ 220 $ 208
Miscellaneous investments   154 164
Debt Securities, Available-for-sale, Unrealized Gain   1,000 1,300
Debt Securities, Available-for-sale, Unrealized Loss $ 7 76  
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]      
Due in one year or less   3  
Due in 1 to 5 years   190  
Due in 5 to 10 years   232  
Due after 10 years   196  
Total   621  
Interest Rate Swap      
Nuclear decommissinoning fund [Abstract]      
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net   4  
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost      
Nuclear decommissinoning fund [Abstract]      
Decommissioning Fund Investments   1,963 [1] 1,962 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Cash equivalents      
Nuclear decommissinoning fund [Abstract]      
Cash equivalents   53 [1] 64 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Commingled funds      
Nuclear decommissinoning fund [Abstract]      
Commingled funds [2]     856
Investments, Fair Value Disclosure [1]   835  
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Debt securities      
Nuclear decommissinoning fund [Abstract]      
Debt securities   668 [1] 631 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Equity securities      
Nuclear decommissinoning fund [Abstract]      
Equity Securities, FV-NI   407 [1] 411 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value      
Nuclear decommissinoning fund [Abstract]      
Alternative investment   1,209 [1] 1,294 [2]
Decommissioning Fund Investments   2,855 [1] 3,256 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Cash equivalents      
Nuclear decommissinoning fund [Abstract]      
Cash equivalents   53 [1] 64 [2]
Alternative investment   0 [1] 0 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Commingled funds      
Nuclear decommissinoning fund [Abstract]      
Commingled funds     1,294
Alternative investment   1,209 [1] 1,294 [2]
Investments, Fair Value Disclosure   1,209  
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Debt securities      
Nuclear decommissinoning fund [Abstract]      
Debt securities   621 [1] 675 [2]
Alternative investment   0 [1] 0 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Equity securities      
Nuclear decommissinoning fund [Abstract]      
Equity Securities, FV-NI   972 [1] 1,223 [2]
Alternative investment   0 [1] 0 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1      
Nuclear decommissinoning fund [Abstract]      
Decommissioning Fund Investments   1,024 [1] 1,286 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Cash equivalents      
Nuclear decommissinoning fund [Abstract]      
Cash equivalents   53 [1] 64 [2]
Nuclear Decommissioning Fund | 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  
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Debt securities      
Nuclear decommissinoning fund [Abstract]      
Debt securities   0 [1] 0 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Equity securities      
Nuclear decommissinoning fund [Abstract]      
Equity Securities, FV-NI   971 [1] 1,222 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2      
Nuclear decommissinoning fund [Abstract]      
Decommissioning Fund Investments   616 [1] 667 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Cash equivalents      
Nuclear decommissinoning fund [Abstract]      
Cash equivalents   0 [1] 0 [2]
Nuclear Decommissioning Fund | 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  
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Debt securities      
Nuclear decommissinoning fund [Abstract]      
Debt securities   615 [1] 666 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Equity securities      
Nuclear decommissinoning fund [Abstract]      
Equity Securities, FV-NI   1 [1] 1 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3      
Nuclear decommissinoning fund [Abstract]      
Decommissioning Fund Investments   6 [1] 9 [2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Cash equivalents      
Nuclear decommissinoning fund [Abstract]      
Cash equivalents   0 [1] 0 [2]
Nuclear Decommissioning Fund | 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  
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Debt securities      
Nuclear decommissinoning fund [Abstract]      
Debt securities   6 [1] 9 [2]
Nuclear Decommissioning Fund | 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 $220 million of equity method investments and $154 million of rabbi trust assets and miscellaneous investments.
[2] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $208 million of equity method investments and $164 million of rabbi trust assets and other miscellaneous investments.