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Business Acquisitions - Summary of preliminary fair values of identified assets acquired and liabilities assumed and residual goodwill (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
[1]
Nov. 01, 2020
Dec. 31, 2019
[1]
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 73,734   $ 81,882 $ 81,025
Dominion        
Business Acquisition [Line Items]        
Property, plant and equipment   $ 9,254    
Goodwill   1,732    
Other   2,376    
Assets acquired   13,362    
Notes payable and other borrowings   5,615    
Other   1,317    
Liabilities assumed   6,932    
Noncontrolling interests   3,916    
Net assets   $ 2,514    
[1] Net of accumulated goodwill impairments of $11.0 billion as of December 31, 2020 and $1.1 billion as of December 31, 2019.