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Regulatory Matters (Other Regulatory Matters) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Feb. 28, 2021
Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]              
Equity in losses of unconsolidated affiliates   $ (9) $ 1,968 $ 8 $ 1,924    
Other current liabilities   1,994   1,994     $ 2,936
Asset retirement obligations   691   691     718
ACP              
Public Utilities, General Disclosures [Line Items]              
Other current liabilities   41   41     $ 936
ACP | ACP              
Public Utilities, General Disclosures [Line Items]              
Equity in losses of unconsolidated affiliates $ 2,100            
Other current liabilities   33   33      
Other noncurrent liabilities   69   69      
ACP | ACP | Current liabilities              
Public Utilities, General Disclosures [Line Items]              
Guarantor obligations settled           $ 855  
Asset retirement obligations   $ 102   $ 102      
ACP              
Public Utilities, General Disclosures [Line Items]              
Joint owner ownership percentage   47.00%   47.00%