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Condensed Consolidated Statements of Changes in Equity - Piedmont - USD ($)
$ in Millions
Total
Common Stock
Retained Earnings
Total Equity
Noncontrolling Interests
Piedmont
Piedmont
Common Stock
Piedmont
Retained Earnings
Piedmont
Total Equity
Piedmont
Noncontrolling Interests
Beginning Balance (Attributable to Parent) at Dec. 31, 2022   $ 1 $ 2,637 $ 49,322     $ 1,635 $ 2,037 $ 3,672  
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2022         $ 2,531         $ 1
Beginning Balance (Parent) at Dec. 31, 2022 $ 51,853         $ 3,673        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 1,878         221   221 221  
Ending Balance (Attributable to Parent) at Sep. 30, 2023   1 2,036 49,006     1,635 2,258 3,893  
Ending Balance (Attributable to Noncontrolling Interest) at Sep. 30, 2023         2,820         1
Ending Balance (Parent) at Sep. 30, 2023 51,826         3,894        
Beginning Balance (Attributable to Parent) at Jun. 30, 2023   1 1,615 48,333     1,635 2,272 3,907  
Beginning Balance (Attributable to Noncontrolling Interest) at Jun. 30, 2023         2,738         1
Beginning Balance (Parent) at Jun. 30, 2023 51,071         3,908        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 1,321         (14)   (14) (14)  
Ending Balance (Attributable to Parent) at Sep. 30, 2023   1 2,036 49,006     1,635 2,258 3,893  
Ending Balance (Attributable to Noncontrolling Interest) at Sep. 30, 2023         2,820         1
Ending Balance (Parent) at Sep. 30, 2023 51,826         3,894        
Beginning Balance (Attributable to Parent) at Dec. 31, 2023 49,112 1 2,235 49,112   4,051 1,635 2,416 4,051  
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2023 1,075       1,075 1       1
Beginning Balance (Parent) at Dec. 31, 2023 50,187         4,052        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 3,387         218   218 218  
Ending Balance (Attributable to Parent) at Sep. 30, 2024 49,133 1 3,052 49,133   4,269 1,635 2,634 4,269  
Ending Balance (Attributable to Noncontrolling Interest) at Sep. 30, 2024 1,116       1,116 1       1
Ending Balance (Parent) at Sep. 30, 2024 50,249         4,270        
Beginning Balance (Attributable to Parent) at Jun. 30, 2024   1 2,635 49,707     1,635 2,658 4,293  
Beginning Balance (Attributable to Noncontrolling Interest) at Jun. 30, 2024         1,099         1
Beginning Balance (Parent) at Jun. 30, 2024 50,806         4,294        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income 1,315         (24)   (24) (24)  
Ending Balance (Attributable to Parent) at Sep. 30, 2024 49,133 $ 1 $ 3,052 $ 49,133   4,269 $ 1,635 $ 2,634 $ 4,269  
Ending Balance (Attributable to Noncontrolling Interest) at Sep. 30, 2024 1,116       $ 1,116 1       $ 1
Ending Balance (Parent) at Sep. 30, 2024 $ 50,249         $ 4,270