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Business Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Nov. 01, 2020
Jul. 03, 2020
Business Acquisition [Line Items]        
Goodwill $ 11,572 $ 11,506    
Natural Gas Transmission and Storage        
Business Acquisition [Line Items]        
Current assets, including cash and cash equivalents of $104     $ 582  
Property, plant and equipment     9,264  
Goodwill     1,741  
Regulatory assets     108  
Deferred income taxes     284  
Other long-term assets     1,424  
Total assets     13,403  
Current liabilities, including current portion of long-term debt of $1,200     1,616  
Long-term debt, less current portion     4,415 $ 5,600
Regulatory liabilities     650  
Other long-term liabilities     292  
Total liabilities     6,973  
Noncontrolling interest     3,916  
Net assets acquired     2,514  
Cash and cash equivalents     104  
Current portion of long-term debt     $ 1,200