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Condensed Consolidated Statements of Changes in Equity - Piedmont - USD ($)
$ in Millions
Total
Piedmont
Piedmont
Common Stock
Piedmont
Retained Earnings
Beginning Balance (parent) at Dec. 31, 2020   $ 2,715 $ 1,310 $ 1,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income Attributable to Duke Energy Corporation $ 1,757 199   199
Contribution from parent   325 325  
Ending Balance (parent) at Jun. 30, 2021   3,239 1,635 1,604
Beginning Balance (parent) at Mar. 31, 2021   3,243 1,635 1,608
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income Attributable to Duke Energy Corporation 765 (4)   (4)
Ending Balance (parent) at Jun. 30, 2021   3,239 1,635 1,604
Beginning Balance (parent) at Dec. 31, 2021 49,296 3,349 1,635 1,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income Attributable to Duke Energy Corporation 1,764 213   213
Ending Balance (parent) at Jun. 30, 2022 49,720 3,562 1,635 1,927
Beginning Balance (parent) at Mar. 31, 2022   3,563 1,635 1,928
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income Attributable to Duke Energy Corporation 907 (1)   (1)
Ending Balance (parent) at Jun. 30, 2022 $ 49,720 $ 3,562 $ 1,635 $ 1,927