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Employee Benefit Plans (Sensitivity to Changes in Assumed Health Care Cost Trend Rates) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Effect on total service and interest costs - 1 Percentage Point Increase | $ 1
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 22
Effect on total service and interest costs - 1 Percentage Point Decrease | (1)
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (20)
Duke Energy Carolinas [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 5
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (5)
Progress Energy [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on total service and interest costs - 1 Percentage Point Increase | 1
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 9
Effect on total service and interest costs - 1 Percentage Point Decrease | (1)
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (8)
Duke Energy Progress [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on total service and interest costs - 1 Percentage Point Increase | 1
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 5
Effect on total service and interest costs - 1 Percentage Point Decrease | (1)
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (5)
Duke Energy Florida [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 4
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (4)
Duke Energy Ohio [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 1
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (1)
Duke Energy Indiana [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 2
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | (2)
Piedmont Natural Gas [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Effect on post-retirement benefit obligation - 1 Percentage Point Increase | 1
Effect on post-retirement benefit obligation - 1 Percentage Point Decrease | $ (1)

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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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