v3.7.0.1
Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Foreign Currency Translation Adjustments [Member]
Net Gains (Losses) on Cash Flow Hedges [Member]
Net Unrealized Gains (Losses) on Available for Sale Securities [Member]
Pension and OPEB Adjustments [Member]
Common Stockholders' Equity [Member]
Noncontrolling Interest [Member]
Duke Energy Carolinas [Member]
Duke Energy Carolinas [Member]
Members Equity [Member]
Duke Energy Carolinas [Member]
Net Gains (Losses) on Cash Flow Hedges [Member]
Progress Energy [Member]
Progress Energy [Member]
Additional Paid-in Capital [Member]
Progress Energy [Member]
Retained Earnings [Member]
Progress Energy [Member]
Net Gains (Losses) on Cash Flow Hedges [Member]
Progress Energy [Member]
Net Unrealized Gains (Losses) on Available for Sale Securities [Member]
Progress Energy [Member]
Pension and OPEB Adjustments [Member]
Progress Energy [Member]
Common Stockholders' Equity [Member]
Progress Energy [Member]
Noncontrolling Interest [Member]
Duke Energy Progress [Member]
Duke Energy Florida [Member]
Duke Energy Florida [Member]
Members Equity [Member]
Duke Energy Florida [Member]
Net Unrealized Gains (Losses) on Available for Sale Securities [Member]
Duke Energy Ohio [Member]
Duke Energy Ohio [Member]
Common Stock [Member]
Duke Energy Ohio [Member]
Additional Paid-in Capital [Member]
Duke Energy Ohio [Member]
Retained Earnings [Member]
Duke Energy Indiana [Member]
Duke Energy Indiana [Member]
Common Stock [Member]
Duke Energy Indiana [Member]
Additional Paid-in Capital [Member]
Duke Energy Indiana [Member]
Retained Earnings [Member]
Duke Energy Indiana [Member]
Members Equity [Member]
Duke Energy Indiana [Member]
Net Gains (Losses) on Cash Flow Hedges [Member]
Piedmont Natural Gas [Member]
Piedmont Natural Gas [Member]
Common Stock [Member]
Piedmont Natural Gas [Member]
Retained Earnings [Member]
Piedmont Natural Gas [Member]
Net Gains (Losses) on Cash Flow Hedges [Member]
Beginning Balance at Dec. 31, 2015 $ 39,771 $ 1 $ 37,968 $ 2,564 $ (692) $ (50) $ (3) $ (61) $ 39,727 $ 44       $ 12,853 $ 8,092 $ 4,831 $ (31)   $ (17) $ 12,875 $ (22)                                    
Beginning Balance, in shares at Dec. 31, 2015   688,000,000                                                                          
Beginning Balance (member's equity) at Dec. 31, 2015                     $ 11,606 $ 11,617 $ (11)                 $ 7,059 $ 5,121 $ 5,121                              
Beginning Balance (parent) at Dec. 31, 2015                                                   $ 2,784 $ 762 $ 2,720 $ (698) $ 3,836 $ 1 $ 1,384 $ 2,450   $ 1 $ 1,458 $ 728 $ 731 $ (1)
Net income 699     694         694 5       212   209       209 3                                    
Net income (attributable to parent) 694                   271 271   209               137 110 110   59     59 95       $ 95   103   103  
Other comprehensive income (loss) 41       48 (12) 4   40 1 1   1 3     1 $ 1 1 3     1   $ 1         (1)         $ (1)        
Common stock issuances, including dividend reinvestment and employee benefits, shares   1,000,000                                                                          
Common stock issuances, including dividend reinvestment and employee benefits 1   1           1                                                     7 7    
Common stock dividends (570)     (570)         (570)                                                     (27)   (27)  
Distributions to parent                     (600) (600)                                                      
Distributions to noncontrolling interest in subsidiaries (1)                 (1)       (1)             (1)                                    
Other                                                             $ (1) $ (1,384) $ (2,450) 3,835          
Ending Balance at Mar. 31, 2016 39,941 $ 1 37,969 2,688 $ (644) (62) 1 (61) 39,892 49       13,067 8,092 5,040 (30) 1 (16) 13,087 (20)                                    
Ending Balance, in shares at Mar. 31, 2016   689,000,000                                                                          
Ending Balance (member's equity) at Mar. 31, 2016                     11,278 11,288 (10)                 7,196 5,232 5,231 1         3,930       3,930          
Ending Balance (parent) at Mar. 31, 2016                                                   $ 2,843 762 2,720 (639)             $ 1,541 735 807 $ (1)
Beginning Balance at Dec. 31, 2016 $ 41,041 $ 1 38,741 2,384   (20) (1) (72) 41,033 8       $ 11,807 8,094 3,764 (23) 1 (16) 11,820 (13)                                    
Beginning Balance, in shares at Dec. 31, 2016 700,000,000 700,000,000                       100                       89,663,086                   100      
Beginning Balance (member's equity) at Dec. 31, 2016                     10,772 10,781 (9)                 7,358 4,900 4,899 1         4,067       4,067          
Beginning Balance (parent) at Dec. 31, 2016 $ 41,033                         $ 11,820                       $ 2,996 762 2,695 (461)             $ 1,672 860 812  
Net income 717     716         716 1       201   199       199 2                                    
Net income (attributable to parent) 716                   270 270   199               147 90 90   $ 42     42 91       91   $ 95   95  
Other comprehensive income (loss) 8         3 4 1 8         3     1 1 1 3     1   1                            
Common stock issuances, including dividend reinvestment and employee benefits 1   1           1                                                            
Common stock dividends (600)     (600)         (600)                                                            
Distributions to parent                     (175) (175)                                                      
Distributions to noncontrolling interest in subsidiaries (2)                 (2)                                                          
Other 21 [1]     21 [1]         21 [1]         1             1                                    
Ending Balance at Mar. 31, 2017 $ 41,186 $ 1 $ 38,742 $ 2,521   $ (17) $ 3 $ (71) $ 41,179 $ 7       $ 12,012 $ 8,094 $ 3,963 $ (22) $ 2 $ (15) $ 12,022 $ (10)                                    
Ending Balance, in shares at Mar. 31, 2017 700,000,000 700,000,000                       100                       89,663,086                   100      
Ending Balance (member's equity) at Mar. 31, 2017                     $ 10,867 $ 10,876 $ (9)                 $ 7,505 $ 4,991 $ 4,989 $ 2         $ 4,158       $ 4,158          
Ending Balance (parent) at Mar. 31, 2017 $ 41,179                         $ 12,022                       $ 3,038 $ 762 $ 2,695 $ (419)             $ 1,767 $ 860 $ 907  
[1] Cumulative-effect adjustment due to implementation of a new accounting standard related to stock-based compensation and the associated income taxes. See Note 1 for more information.