Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	$ 1,145	$ 1,322
Regulatory assets	12,157us-gaap_RegulatoryAssets	10,086us-gaap_RegulatoryAssets
Regulatory liabilities	6,397us-gaap_RegulatoryLiabilities	6,265us-gaap_RegulatoryLiabilities
Duke Energy Carolinas [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	111	161
Regulatory assets	2,864	1,822
Regulatory liabilities	2,744	2,641
Progress Energy [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	533	765
Regulatory assets	5,899	4,508
Regulatory liabilities	2,485	2,499
Duke Energy Progress [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	290	321
Regulatory assets	2,962	1,511
Regulatory liabilities	1,903	1,736
Duke Energy Florida [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	221	286
Regulatory assets	2,936	2,950
Regulatory liabilities	582	762
Duke Energy Ohio [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	48	58
Regulatory assets	561	528
Regulatory liabilities	251	289
Duke Energy Indiana [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	82	163
Regulatory assets	778	835
Regulatory liabilities	850	798
Qualified Pension Plans [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	441	632
Noncurrent pension liability	50
Net amount recognized	391	632
Regulatory assets	1,711	1,599
Accumulated Other Comprehensive Income (Loss) [Abstract]
Deferred income tax asset	(51)	(41)
Prior year service cost (credit) arising during the year	(5)	(5)
Net actuarial loss (gain)	140	121
Net amount recognized in accumulated other comprehensive income (loss)	84	75
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	166
Unrecognized prior service (credit) cost	(15)
Qualified Pension Plans [Member] \| Brazilian Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Abstract]
Net amount recognized in accumulated other comprehensive income (loss)	22	16
Qualified Pension Plans [Member] \| Duke Energy Carolinas [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	247	287
Net amount recognized	247	287
Regulatory assets	407	377
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	39
Unrecognized prior service (credit) cost	(8)
Qualified Pension Plans [Member] \| Progress Energy [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	165	230
Noncurrent pension liability		25
Net amount recognized	165	205
Regulatory assets	753	826
Accumulated Other Comprehensive Income (Loss) [Abstract]
Deferred income tax asset	(11)	(9)
Net actuarial loss (gain)	21	21
Net amount recognized in accumulated other comprehensive income (loss)	10	12
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	65
Unrecognized prior service (credit) cost	(3)
Qualified Pension Plans [Member] \| Duke Energy Progress [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	134	158
Net amount recognized	134	158
Regulatory assets	346	363
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	34
Unrecognized prior service (credit) cost	(2)
Qualified Pension Plans [Member] \| Duke Energy Florida [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	28	66
Net amount recognized	28	66
Regulatory assets	406	395
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	31
Unrecognized prior service (credit) cost	(1)
Qualified Pension Plans [Member] \| Duke Energy Ohio [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension		2
Noncurrent pension liability	13	(4)
Net amount recognized	(13)	6
Regulatory assets	65	48
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	6
Qualified Pension Plans [Member] \| Duke Energy Indiana [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	8	75
Noncurrent pension liability		53
Net amount recognized	8	22
Regulatory assets	151	147
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	14
Non-Qualified Pension Plans [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	27	30
Noncurrent pension liability	310	274
Total accrued pension liability	337	304
Regulatory assets	89	45
Regulatory liabilities		7
Accumulated Other Comprehensive Income (Loss) [Abstract]
Deferred income tax asset	4
Prior year service cost (credit) arising during the year	(1)	(1)
Net actuarial loss (gain)	(8)	1
Net amount recognized in accumulated other comprehensive income (loss)	(5)
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	6
Unrecognized prior service (credit) cost	(1)
Non-Qualified Pension Plans [Member] \| Duke Energy Carolinas [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	2	2
Noncurrent pension liability	14	13
Total accrued pension liability	16	15
Regulatory assets	5	4
Regulatory liabilities		0
Non-Qualified Pension Plans [Member] \| Progress Energy [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	8	11
Noncurrent pension liability	108	129
Total accrued pension liability	116	140
Regulatory assets	32	18
Regulatory liabilities		0
Accumulated Other Comprehensive Income (Loss) [Abstract]
Deferred income tax asset	2	(3)
Net actuarial loss (gain)	(4)	7
Net amount recognized in accumulated other comprehensive income (loss)	(2)	4
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	2
Non-Qualified Pension Plans [Member] \| Duke Energy Progress [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	3	2
Noncurrent pension liability	32	32
Total accrued pension liability	35	34
Regulatory assets	7	3
Regulatory liabilities		0
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	1
Non-Qualified Pension Plans [Member] \| Duke Energy Florida [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	4	3
Noncurrent pension liability	57	36
Total accrued pension liability	61	39
Regulatory assets	25	6
Regulatory liabilities		0
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	2
Non-Qualified Pension Plans [Member] \| Duke Energy Ohio [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	0
Noncurrent pension liability	4	3
Total accrued pension liability	4	3
Regulatory assets	1
Regulatory liabilities		0
Non-Qualified Pension Plans [Member] \| Duke Energy Indiana [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	0
Noncurrent pension liability	5	5
Total accrued pension liability	5	5
Regulatory assets	2
Regulatory liabilities		0
Other Post-Retirement Benefit Plans [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	35	39
Noncurrent pension liability	654	853
Total accrued pension liability	689	892
Regulatory assets		(162)
Regulatory liabilities	380	131
Accumulated Other Comprehensive Income (Loss) [Abstract]
Deferred income tax liability	5	4
Prior year service cost (credit) arising during the year	(9)	(5)
Net actuarial loss (gain)	(5)	(6)
Net amount recognized in accumulated other comprehensive income (loss)	(9)	(7)
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	16
Unrecognized prior service (credit) cost	(140)
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Carolinas [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	75	122
Total accrued pension liability	75	122
Regulatory assets		(34)
Regulatory liabilities	76
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	(1)
Unrecognized prior service (credit) cost	(14)
Other Post-Retirement Benefit Plans [Member] \| Progress Energy [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	29	36
Noncurrent pension liability	350	497
Total accrued pension liability	379	533
Regulatory assets		(129)
Regulatory liabilities	122
Accumulated Other Comprehensive Income (Loss) [Abstract]
Deferred income tax liability	1
Net actuarial loss (gain)	(2)
Net amount recognized in accumulated other comprehensive income (loss)	(1)
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	28
Unrecognized prior service (credit) cost	(103)
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Progress [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	16	17
Noncurrent pension liability	192	216
Total accrued pension liability	208	233
Regulatory assets		(97)
Regulatory liabilities	61
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	18
Unrecognized prior service (credit) cost	(68)
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Florida [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	14	16
Noncurrent pension liability	156	237
Total accrued pension liability	170	253
Regulatory assets		4
Regulatory liabilities	61
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	10
Unrecognized prior service (credit) cost	(35)
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Ohio [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	2	2
Noncurrent pension liability	29	32
Total accrued pension liability	31	34
Regulatory liabilities	19	21
Amounts to be recognized in net periodic pension expense in the next year [Abstract]
Unrecognized net actuarial loss	(2)
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Indiana [Member]
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	73	100
Total accrued pension liability	73	100
Regulatory assets	64	71
Regulatory liabilities	$ 91	$ 77

Deferred income tax asset related to defined benefit plan impacts included in accumulated other comprehensive income.

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Deferred income tax liability related to defined benefit plan impacts included in accumulated other comprehensive income.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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