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Variable Interest Entities (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Feb. 28, 2021
Variable Interest Entities [Line Items]              
Equity in earnings (losses) of unconsolidated affiliates   $ 22,000,000 $ (80,000,000) $ 14,000,000 $ (2,004,000,000)    
ACP | ACP              
Variable Interest Entities [Line Items]              
Equity in earnings (losses) of unconsolidated affiliates $ (2,100,000,000)            
ACP | Current liabilities | ACP              
Variable Interest Entities [Line Items]              
Guarantor obligations settled             $ 855,000,000
VIE primary beneficiary              
Variable Interest Entities [Line Items]              
Variable interest entity, financial or other support, amount       $ 0   $ 0  
VIE primary beneficiary | CRC              
Variable Interest Entities [Line Items]              
Percent of proceeds received as cash   75.00%   75.00%      
Percent of proceeds received as subordinated note   25.00%   25.00%      
Minimum equity balance required by Cinergy Receivables   $ 3,000,000   $ 3,000,000      
VIE not primary beneficiary | ACP              
Variable Interest Entities [Line Items]              
Equity in earnings (losses) of unconsolidated affiliates     $ (163,000,000)   $ (4,505,000,000)    
VIE not primary beneficiary | ACP              
Variable Interest Entities [Line Items]              
Variable interest entity ownership interest       47.00%      
VIE not primary beneficiary | VIE With Ownership In Portfolio Of Wind Projects              
Variable Interest Entities [Line Items]              
Variable interest entity ownership interest       50.00%      
VIE not primary beneficiary | OVEC              
Variable Interest Entities [Line Items]              
Variable interest entity ownership interest       9.00%