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Investments In Debt And Equity Securities (Summarizes The Maturity Date For Debt Securities) (Details) (Duke Energy Corp [Member], USD $)
In Millions, unless otherwise specified

Mar. 31, 2012

Duke Energy Corp [Member]

1 year

$ 168

^[1]

1 through 5 years

404

^[1]

6 to 10 years

223

^[1]

Thereafter

$ 401

^[1]

[1]	Excludes auction rate securities based on the stated maturity date. See Note 9 for information about fair value measurements related to investments in auction rate debt securities.

- Definition

This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the fair value of debt securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details