Condensed Consolidated Balance Sheets (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 2,032	$ 1,670
Short-term investments	146
Receivables (net of allowance for doubtful accounts)	764	855
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	1,152	1,302
Inventory	1,421	1,318
Other	758	1,078
Total current assets	6,273	6,223
Investments and Other Assets
Investments in equity method unconsolidated affiliates	459	444
Nuclear decommissioning trust funds	1,924	2,014
Goodwill	3,847	3,858
Intangibles, net	371	467
Notes receivable	59	42
Restricted other assets of variable interest entities	176	139
Other	2,236	2,300
Total investments and other assets	9,072	9,264
Property, Plant and Equipment
Cost	59,861	57,597
Cost, variable interest entities	921	942
Less accumulated depreciation and amortization	18,905	18,195
Net property, plant and equipment	41,877	40,344
Regulatory Assets and Deferred Debits
Deferred debt expense	232	246
Regulatory assets related to income taxes	843	780
Other	2,479	2,233
Total regulatory assets and deferred debits	3,554	3,259
Total Assets	60,776	59,090
LIABILITIES AND EQUITY
Accounts payable	1,080	1,587
Notes payable	480
Non-recourse notes payable of variable interest entities	275	216
Taxes accrued	438	412
Interest accrued	269	237
Current maturities of long-term debt	1,527	275
Other	1,046	1,170
Total current liabilities	5,115	3,897
Long-term Debt	16,625	16,959
Non-recourse Long-term Debt of Variable Interest Entities	959	976
Deferred Credits and Other Liabilities
Deferred Income Taxes	7,466	6,978
Investment tax credits	377	359
Asset retirement obligations	1,905	1,816
Other	5,430	5,452
Total deferred credits and other liabilities	15,178	14,605
Commitments and Contingencies
Equity
Common Stock	1	1
Additional paid-in capital	21,061	21,023
Retained earnings (deficit)	1,920	1,496
Accumulated other comprehensive income (loss)	(188)	2
Total common stockholder's equity	22,794	22,522
Noncontrolling interests	105	131
Total equity	22,899	22,653
Total Liabilities and Equity	60,776	59,090
Duke Energy Carolinas [Member]
ASSETS
Cash and cash equivalents	318	153
Receivables (net of allowance for doubtful accounts)	825	669
Restricted receivables of variable interest entities (net of allowance for doubtful accounts)	637	637
Inventory	757	716
Other	283	398
Total current assets	2,820	2,573
Investments and Other Assets
Nuclear decommissioning trust funds	1,924	2,014
Other	1,026	1,119
Total investments and other assets	2,950	3,133
Property, Plant and Equipment
Cost	32,623	31,191
Less accumulated depreciation and amortization	11,458	11,126
Net property, plant and equipment	21,165	20,065
Regulatory Assets and Deferred Debits
Deferred debt expense	161	169
Regulatory assets related to income taxes	661	601
Other	1,080	847
Total regulatory assets and deferred debits	1,902	1,617
Total Assets	28,837	27,388
LIABILITIES AND EQUITY
Accounts payable	545	856
Taxes accrued	132	114
Interest accrued	148	109
Current maturities of long-term debt	757	8
Other	468	485
Total current liabilities	2,050	1,572
Long-term Debt	7,216	7,462
Non-recourse Long-term Debt of Variable Interest Entities	300	300
Deferred Credits and Other Liabilities
Deferred Income Taxes	4,530	3,988
Investment tax credits	226	205
Accrued pension and other post-retirement benefit costs	237	242
Asset retirement obligations	1,814	1,728
Other	2,836	2,975
Total deferred credits and other liabilities	9,643	9,138
Commitments and Contingencies
Equity
Accumulated other comprehensive income (loss)	(19)	(22)
Member's Equity	9,647	8,938
Total member's equity	9,628	8,916
Total Liabilities and Member's Equity	28,837	27,388
Duke Energy Ohio [Member]
ASSETS
Cash and cash equivalents	216	228
Receivables (net of allowance for doubtful accounts)	497	888
Inventory	283	254
Other	149	121
Total current assets	1,145	1,491
Investments and Other Assets
Goodwill	921	921
Intangibles, net	148	248
Other	55	62
Total investments and other assets	1,124	1,231
Property, Plant and Equipment
Cost	10,516	10,259
Less accumulated depreciation and amortization	2,579	2,411
Net property, plant and equipment	7,937	7,848
Regulatory Assets and Deferred Debits
Deferred debt expense	21	23
Regulatory assets related to income taxes	74	78
Other	358	353
Total regulatory assets and deferred debits	453	454
Total Assets	10,659	11,024
LIABILITIES AND EQUITY
Accounts payable	295	467
Taxes accrued	155	153
Interest accrued	33	22
Current maturities of long-term debt	507	7
Other	92	99
Total current liabilities	1,082	748
Long-term Debt	2,051	2,557
Deferred Credits and Other Liabilities
Deferred Income Taxes	1,802	1,640
Investment tax credits	8	9
Accrued pension and other post-retirement benefit costs	188	207
Asset retirement obligations	28	27
Other	364	372
Total deferred credits and other liabilities	2,390	2,255
Commitments and Contingencies
Equity
Common Stock	762	762
Additional paid-in capital	5,085	5,570
Retained earnings (deficit)	(689)	(846)
Accumulated other comprehensive income (loss)	(22)	(22)
Total common stockholder's equity	5,136	5,464
Total Liabilities and Equity	10,659	11,024
Duke Energy Indiana [Member]
ASSETS
Cash and cash equivalents	21	54
Receivables (net of allowance for doubtful accounts)	223	431
Inventory	283	267
Other	35	85
Total current assets	562	837
Investments and Other Assets
Intangibles, net	53	64
Other	120	126
Total investments and other assets	173	190
Property, Plant and Equipment
Cost	11,711	11,213
Less accumulated depreciation and amortization	3,445	3,341
Net property, plant and equipment	8,266	7,872
Regulatory Assets and Deferred Debits
Deferred debt expense	40	43
Regulatory assets related to income taxes	108	101
Other	614	588
Total regulatory assets and deferred debits	762	732
Total Assets	9,763	9,631
LIABILITIES AND EQUITY
Accounts payable	277	314
Notes payable	14
Taxes accrued	122	45
Interest accrued	49	47
Current maturities of long-term debt	13	11
Other	90	99
Total current liabilities	565	516
Long-term Debt	3,456	3,461
Deferred Credits and Other Liabilities
Deferred Income Taxes	881	973
Investment tax credits	143	145
Accrued pension and other post-retirement benefit costs	261	270
Asset retirement obligations	47	46
Other	731	653
Total deferred credits and other liabilities	2,063	2,087
Commitments and Contingencies
Equity
Common Stock	1	1
Additional paid-in capital	1,358	1,358
Retained earnings (deficit)	2,313	2,200
Accumulated other comprehensive income (loss)	7	8
Total common stockholder's equity	3,679	3,567
Total Liabilities and Equity	$ 9,763	$ 9,631