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Condensed Consolidated Statements Of Member's Equity and Comprehensive Income - Carolinas (USD $)
In Millions
Duke Energy Carolinas [Member]
Member's Equity [Member]
Duke Energy Carolinas [Member]
Net (Losses) Gains On Cash Flow Hedges [Member]
Duke Energy Carolinas [Member]
Other Equity [Member]
Duke Energy Carolinas [Member]
Net (Losses) Gains On Cash Flow Hedges [Member]
Other Equity [Member]
Total
Balance at Dec. 31, 2009$ 8,304$ (24)$ (9)$ 8,271   
Net income (loss)709  709  894
Other comprehensive income (loss)       
Reclassification into earnings from cash flow hedges 2[1] 2[1](2)[2] (2)[2]
Unrealized gain on investments in auction rate securities  2[3]2[3] 8[4]8[4]
Total comprehensive income (loss)   713  971
Dividends to parent(350)  (350)   
Balance at Sep. 30, 20108,663(22)(7)8,634   
Balance at Jun. 30, 2010       
Net income (loss)   315  666
Other comprehensive income (loss)       
Unrealized gain on investments in auction rate securities[5]      2
Total comprehensive income (loss)      765
Balance at Sep. 30, 2010   8,634   
Balance at Dec. 31, 20108,938(20)(2)8,916   
Net income (loss)709  709  1,424
Other comprehensive income (loss)       
Reclassification into earnings from cash flow hedges 3[1] 3[1](3)[2] (3)[2]
Unrealized gain on investments in auction rate securities[4]     77
Total comprehensive income (loss)   712  1,226
Balance at Sep. 30, 20119,647(17)(2)9,628   
Balance at Jun. 30, 2011       
Net income (loss)   311  470
Other comprehensive income (loss)       
Reclassification into earnings from cash flow hedges[5]      1
Unrealized gain on investments in auction rate securities[6]      3
Total comprehensive income (loss)      182
Balance at Sep. 30, 2011  $ (2)$ 9,628   
[1]Net of $1 tax expense in 2011 and 2010.
[2]Net of $1 tax expense in 2011 and insignificant tax benefit in 2010.
[3]Net of $1 tax expense in 2010.
[4]Net of $6 tax expense in 2011 and $4 tax expense in 2010.
[5]Net of insignificant tax expense.
[6]Net of $5 million tax expense.