Employee Benefit Plans (Projected Benefit Obligations Reconciliation of Funded Status to Net Amount Recognized) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Qualified Pension Plans [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	$ 7,510	$ 8,030
Service cost	135	167	122
Interest cost on projected benefit obligation	344	320	307
Actuarial (gains) losses	618	(399)
Plan amendments	(4)	(41)
Benefits paid	(496)	(567)
Obligation at measurement date	8,107	7,510	8,030
Accumulated benefit obligation at measurement date	7,966	7,361
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	8,142	7,754
Actual return on plan assets	852	705
Benefits paid	(496)	(567)
Employer contributions		250	304
Plan assets at measurement date	8,498	8,142	7,754
Funded status of plan	391	632
Qualified Pension Plans [Member] \| Change in Assumptions for Pension Plans [Member]
Change in Projected Benefit Obligation [Rollforward]
Actuarial (gains) losses	180
Qualified Pension Plans [Member] \| Duke Energy Carolinas [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,875	2,028
Service cost	41	49	35
Interest cost on projected benefit obligation	85	80	90
Actuarial (gains) losses	132	(73)
Transfers of benefit obligation	37	(26)
Plan amendments	(1)	(13)
Benefits paid	(116)	(170)
Obligation at measurement date	2,053	1,875	2,028
Accumulated benefit obligation at measurement date	2,052	1,875
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	2,162	2,151
Actual return on plan assets	217	207
Benefits paid	(116)	(170)
Transfer of plan assets	37	(26)
Plan assets at measurement date	2,300	2,162	2,151
Funded status of plan	247	287
Qualified Pension Plans [Member] \| Progress Energy [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	2,739	2,868
Service cost	40	60	63
Interest cost on projected benefit obligation	112	116	127
Actuarial (gains) losses	211	(118)
Transfers of benefit obligation	(375)	(7)
Plan amendments		(19)
Benefits paid	(170)	(161)
Obligation at measurement date	2,557	2,739	2,868
Accumulated benefit obligation at measurement date	2,519	2,698
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	2,944	2,647
Actual return on plan assets	300	215
Benefits paid	(170)	(161)
Transfer of plan assets	(352)	(7)
Employer contributions		250	346
Plan assets at measurement date	2,722	2,944	2,647
Funded status of plan	165	205
Qualified Pension Plans [Member] \| Duke Energy Progress [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,172	1,264
Service cost	21	22	25
Interest cost on projected benefit obligation	54	50	58
Actuarial (gains) losses	98	(26)
Transfers of benefit obligation	(61)	(45)
Plan amendments		(8)
Benefits paid	(97)	(85)
Obligation at measurement date	1,187	1,172	1,264
Accumulated benefit obligation at measurement date	1,187	1,172
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,330	1,289
Actual return on plan assets	149	108
Benefits paid	(97)	(85)
Transfer of plan assets	(61)	(45)
Employer contributions		63	141
Plan assets at measurement date	1,321	1,330	1,289
Funded status of plan	134	158
Qualified Pension Plans [Member] \| Duke Energy Florida [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,233	1,309
Service cost	20	30	30
Interest cost on projected benefit obligation	57	53	56
Actuarial (gains) losses	105	(75)
Transfers of benefit obligation	(9)	(17)
Plan amendments		(7)
Benefits paid	(71)	(60)
Obligation at measurement date	1,335	1,233	1,309
Accumulated benefit obligation at measurement date	1,297	1,192
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,299	1,150
Actual return on plan assets	144	93
Benefits paid	(71)	(60)
Transfer of plan assets	(9)	(17)
Employer contributions		133	128
Plan assets at measurement date	1,363	1,299	1,150
Funded status of plan	28	66
Qualified Pension Plans [Member] \| Duke Energy Ohio [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	442	527
Service cost	4	6	6
Interest cost on projected benefit obligation	20	21	31
Actuarial (gains) losses	41	(71)
Transfers of benefit obligation	(6)	(2)
Plan amendments	(1)
Benefits paid	(31)	(39)
Obligation at measurement date	469	442	527
Accumulated benefit obligation at measurement date	459	429
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	448	446
Actual return on plan assets	45	43
Benefits paid	(31)	(39)
Transfer of plan assets	(6)	(2)
Plan assets at measurement date	456	448	446
Funded status of plan	(13)	6
Qualified Pension Plans [Member] \| Duke Energy Indiana [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	632	684
Service cost	9	11	9
Interest cost on projected benefit obligation	29	28	30
Actuarial (gains) losses	41	(56)
Transfers of benefit obligation		(2)
Benefits paid	(38)	(33)
Obligation at measurement date	673	632	684
Accumulated benefit obligation at measurement date	645	608
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	654	627
Actual return on plan assets	65	62
Benefits paid	(38)	(33)
Transfer of plan assets		(2)
Plan assets at measurement date	681	654	627
Funded status of plan	8	22
Non Qualified Pension Plans [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	304	335
Service cost	3	3	2
Interest cost on projected benefit obligation	14	13	12
Actuarial (gains) losses	43	(15)
Settlements		(5)
Plan amendments		(1)
Benefits paid	(27)	(26)
Obligation at measurement date	337	304	335
Accumulated benefit obligation at measurement date	333	302
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(27)	(26)
Employer contributions	27	26
Non Qualified Pension Plans [Member] \| Change in Assumptions for Pension Plans [Member]
Change in Projected Benefit Obligation [Rollforward]
Actuarial (gains) losses	21
Non Qualified Pension Plans [Member] \| Duke Energy Carolinas [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	15	16
Interest cost on projected benefit obligation	1	1	1
Actuarial (gains) losses	2	1
Benefits paid	(2)	(3)
Obligation at measurement date	16	15	16
Accumulated benefit obligation at measurement date	15	15
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(2)	(3)
Employer contributions	2	3
Non Qualified Pension Plans [Member] \| Progress Energy [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	140	176
Service cost	1	1	2
Interest cost on projected benefit obligation	5	7	8
Actuarial (gains) losses	11	(11)
Transfers of benefit obligation	(32)	(21)
Benefits paid	(9)	(12)
Obligation at measurement date	116	140	176
Accumulated benefit obligation at measurement date	116	140
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(9)	(12)
Employer contributions	9	12
Non Qualified Pension Plans [Member] \| Duke Energy Progress [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	34	38
Service cost	1	1	1
Interest cost on projected benefit obligation	1	1	1
Actuarial (gains) losses	2	(3)
Benefits paid	(3)	(3)
Obligation at measurement date	35	34	38
Accumulated benefit obligation at measurement date	35	34
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(3)	(3)
Employer contributions	3	3
Non Qualified Pension Plans [Member] \| Duke Energy Florida [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	39	45
Interest cost on projected benefit obligation	2	1	2
Actuarial (gains) losses	20	(3)
Transfers of benefit obligation	4
Benefits paid	(4)	(4)
Obligation at measurement date	61	39	45
Accumulated benefit obligation at measurement date	61	39
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(4)	(4)
Employer contributions	4	4
Non Qualified Pension Plans [Member] \| Duke Energy Ohio [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	3	4
Actuarial (gains) losses	1	(1)
Obligation at measurement date	4	3
Accumulated benefit obligation at measurement date	4	3
Non Qualified Pension Plans [Member] \| Duke Energy Indiana [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	5
Actuarial (gains) losses	1
Benefits paid	(1)
Obligation at measurement date	5		5
Accumulated benefit obligation at measurement date	5	5
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(1)
Employer contributions	1
Other Post-Retirement Benefit Plans [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,106	1,794
Service cost	10	24	16
Interest cost on projected benefit obligation	49	68	56
Plan participants' contributions	25	47
Actuarial (gains) losses	(87)	(227)
Plan amendments	(85)	(476)
Benefits paid	(103)	(132)
Accrued retiree drug subsidy	1	8
Obligation at measurement date	916	1,106	1,794
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	214	198
Actual return on plan assets	18	18
Benefits paid	(103)	(132)
Employer contributions	73	83
Plan participants' contributions	25	47
Plan assets at measurement date	227	214	198
Other Post-Retirement Benefit Plans [Member] \| Change in Assumptions for Pension Plans [Member]
Change in Projected Benefit Obligation [Rollforward]
Actuarial (gains) losses	7
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Carolinas [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	265	316
Service cost	2	2	2
Interest cost on projected benefit obligation	12	13	15
Plan participants' contributions	10	15
Actuarial (gains) losses	(35)	(32)
Transfers of benefit obligation	1
Plan amendments	(4)	(16)
Benefits paid	(31)	(36)
Accrued retiree drug subsidy		3
Obligation at measurement date	220	265	316
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	143	134
Actual return on plan assets	12	13
Benefits paid	(31)	(36)
Transfer of plan assets	(1)	(1)
Employer contributions	12	18
Plan participants' contributions	10	15
Plan assets at measurement date	145	143	134
Other Post-Retirement Benefit Plans [Member] \| Progress Energy [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	533	1,128
Service cost	4	18	17
Interest cost on projected benefit obligation	22	41	43
Plan participants' contributions	8	14
Actuarial (gains) losses	(19)	(156)
Transfers of benefit obligation	(48)	(1)
Plan amendments	(77)	(455)
Benefits paid	(44)	(60)
Accrued retiree drug subsidy		4
Obligation at measurement date	379	533	1,128
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(44)	(60)
Employer contributions	36	46
Plan participants' contributions	8	14
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Progress [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	233	612
Service cost	1	9	8
Interest cost on projected benefit obligation	11	22	23
Plan participants' contributions	4	6
Actuarial (gains) losses	(21)	(73)
Transfers of benefit obligation	(2)	(8)
Plan amendments		(311)
Benefits paid	(19)	(26)
Accrued retiree drug subsidy		2
Obligation at measurement date	207	233	612
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(19)	(26)
Employer contributions	14	20
Plan participants' contributions	4	6
Plan assets at measurement date	(1)
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Florida [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	253	413
Service cost	3	7	7
Interest cost on projected benefit obligation	12	16	18
Plan participants' contributions	4	7
Actuarial (gains) losses		(70)
Plan amendments	(78)	(91)
Benefits paid	(24)	(31)
Accrued retiree drug subsidy		2
Obligation at measurement date	170	253	413
Change in Fair Value of Plan Assets [Rollforward]
Benefits paid	(24)	(31)
Employer contributions	20	24
Plan participants' contributions	4	7
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Ohio [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	42	48
Service cost		1	1
Interest cost on projected benefit obligation	2	2	3
Plan participants' contributions		3
Actuarial (gains) losses		(6)
Transfers of benefit obligation	(1)
Plan amendments	(1)
Benefits paid	(3)	(6)
Obligation at measurement date	39	42	48
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	8	7
Actual return on plan assets		2
Benefits paid	(3)	(6)
Employer contributions	3	2
Plan participants' contributions		3
Plan assets at measurement date	8	8	7
Other Post-Retirement Benefit Plans [Member] \| Duke Energy Indiana [Member]
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	118	136
Service cost	1	1	1
Interest cost on projected benefit obligation	5	5	6
Plan participants' contributions	2	3
Actuarial (gains) losses	(20)	(12)
Plan amendments		(3)
Benefits paid	(10)	(14)
Accrued retiree drug subsidy		2
Obligation at measurement date	96	118	136
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	18	17
Actual return on plan assets	2	2
Benefits paid	(10)	(14)
Employer contributions	11	10
Plan participants' contributions	2	3
Plan assets at measurement date	$ 23	$ 18	$ 17

Value of benefit obligation transferred into (out of) a defined benefit pension plan.

No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

-URI http://asc.fasb.org/extlink&oid=6504192

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-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Gain or Loss

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- Definition

Fair value of assets transferred into (out of) a defined benefit pension plan.

+ References

No definition available.

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

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-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Postretirement Benefits

-URI http://asc.fasb.org/extlink&oid=6521376

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-Subparagraph (a)(6)

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

+ Details

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- Definition

The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

+ References

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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- Definition

Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

+ Details

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- Definition

The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Glossary Plan Amendment

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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