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Asset Retirement Obligations (Rollforward)(Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Asset Retirement Obligation [Line Items]    
Balance as of January 1 $ 10,249 $ 8,464
Acquisitions 22 226
Accretion expense 400 380
Liabilities settled (613) (422)
Liabilities incurred in the current year 51 1,016
Revisions in estimates of cash flows 502 585
Balance as of December 31 10,611 10,249
Duke Energy Carolinas [Member]    
Asset Retirement Obligation [Line Items]    
Balance as of January 1 3,918 3,428
Accretion expense 187 165
Liabilities settled (287) (200)
Liabilities incurred in the current year   178
Revisions in estimates of cash flows 77 347
Balance as of December 31 3,895 3,918
Progress Energy [Member]    
Asset Retirement Obligation [Line Items]    
Balance as of January 1 5,369 4,711
Acquisitions 2 226
Accretion expense 230 203
Liabilities settled (272) (195)
Liabilities incurred in the current year 3 282
Revisions in estimates of cash flows 143 142
Balance as of December 31 5,475 5,369
Duke Energy Progress [Member]    
Asset Retirement Obligation [Line Items]    
Balance as of January 1 4,567 3,905
Acquisitions   204
Accretion expense 194 169
Liabilities settled (212) (125)
Liabilities incurred in the current year 3 282
Revisions in estimates of cash flows 145 132
Balance as of December 31 4,697 4,567
Duke Energy Florida [Member]    
Asset Retirement Obligation [Line Items]    
Balance as of January 1 802 806
Acquisitions 2 23
Accretion expense 35 34
Liabilities settled (60) (70)
Revisions in estimates of cash flows (1) 9
Balance as of December 31 778 802
Duke Energy Ohio [Member]    
Asset Retirement Obligation [Line Items]    
Balance as of January 1 125 27
Accretion expense 5 4
Liabilities settled (5) (4)
Liabilities incurred in the current year   116
Revisions in estimates of cash flows (48) (18)
Balance as of December 31 77 125
Duke Energy Indiana [Member]    
Asset Retirement Obligation [Line Items]    
Balance as of January 1 525 32
Accretion expense 24 15
Liabilities settled (49) (23)
Liabilities incurred in the current year 29 418
Revisions in estimates of cash flows 337 83
Balance as of December 31 $ 866 $ 525