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Asset Retirement Obligations (ARO Rollforward) (Details) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||||||||||
| Balance at beginning of period | $ 4,958 | [1],[2] | ||||||||
| Accretion expense | 164 | [3] | ||||||||
| Liabilities settled | (56) | |||||||||
| Liabilities incurred in the current year | 3,433 | [4] | ||||||||
| Balance at end of period | 8,499 | |||||||||
|
Duke Energy Carolinas [Member]
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| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||||||||||
| Balance at beginning of period | 1,594 | |||||||||
| Accretion expense | 71 | [3] | ||||||||
| Liabilities settled | ||||||||||
| Liabilities incurred in the current year | 2,026 | [4] | ||||||||
| Balance at end of period | 3,691 | |||||||||
|
Progress Energy [Member]
|
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| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||||||||||
| Balance at beginning of period | 2,570 | [2] | ||||||||
| Accretion expense | 91 | [3] | ||||||||
| Liabilities settled | (52) | |||||||||
| Liabilities incurred in the current year | 1,406 | [4] | ||||||||
| Balance at end of period | 4,015 | |||||||||
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Duke Energy Progress [Member]
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| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||||||||||
| Balance at beginning of period | 1,737 | [2] | ||||||||
| Accretion expense | 63 | [3] | ||||||||
| Liabilities settled | ||||||||||
| Liabilities incurred in the current year | 1,406 | [4] | ||||||||
| Balance at end of period | 3,206 | |||||||||
| Asset retirement obligation, current | $ 8 | |||||||||
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