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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2011
Subsequent Events	23. Subsequent Events For information on subsequent events related to acquisitions, regulatory matters, commitments and contingencies, debt and credit facilities and joint ownership of generating and transmission facilities, see Notes 3, 4, 5, 6 and 8 respectively.
Duke Energy Corp [Member]
Subsequent Events	23. Subsequent Events For information on subsequent events related to acquisitions, regulatory matters, commitments and contingencies, debt and credit facilities and joint ownership of generating and transmission facilities, see Notes 3, 4, 5, 6 and 8 respectively.
Duke Energy Carolinas [Member]
Subsequent Events	23. Subsequent Events For information on subsequent events related to acquisitions, regulatory matters, commitments and contingencies, debt and credit facilities and joint ownership of generating and transmission facilities, see Notes 3, 4, 5, 6 and 8 respectively.
Duke Energy Ohio [Member]
Subsequent Events	23. Subsequent Events For information on subsequent events related to acquisitions, regulatory matters, commitments and contingencies, debt and credit facilities and joint ownership of generating and transmission facilities, see Notes 3, 4, 5, 6 and 8 respectively.
Duke Energy Indiana [Member]
Subsequent Events	23. Subsequent Events For information on subsequent events related to acquisitions, regulatory matters, commitments and contingencies, debt and credit facilities and joint ownership of generating and transmission facilities, see Notes 3, 4, 5, 6 and 8 respectively.

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

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