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Fair Value Measurements (Significant Unobservable Inputs) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure $ 1,167us-gaap_AssetsFairValueDisclosure
Liabilities, Fair Value Disclosure 420us-gaap_LiabilitiesFairValueDisclosure
Forward Contracts - Power [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure 487us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure 97us-gaap_LiabilitiesFairValueDisclosure
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Forward Contracts - Power [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 119us-gaap_FairValueInputsOfferedQuotes
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Forward Contracts - Power [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 6us-gaap_FairValueInputsOfferedQuotes
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Forward contracts - Gas [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure 74us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure 55us-gaap_LiabilitiesFairValueDisclosure
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Forward contracts - Gas [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 6us-gaap_FairValueInputsOfferedQuotes
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Forward contracts - Gas [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 1us-gaap_FairValueInputsOfferedQuotes
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Forward contracts - Other [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure 44us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure 41us-gaap_LiabilitiesFairValueDisclosure
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Forward contracts - Other [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 13us-gaap_FairValueInputsOfferedQuotes
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Forward contracts - Other [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 0us-gaap_FairValueInputsOfferedQuotes
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Option Contracts, Power [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure 114us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure 92us-gaap_LiabilitiesFairValueDisclosure
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Option Contracts, Power [Member] | Implied Correlations [Member] | Maximum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 98.00%nee_FairValueInputsExpectedRates
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Option Contracts, Power [Member] | Implied Correlations [Member] | Minimum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates (4.00%)nee_FairValueInputsExpectedRates
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Option Contracts, Power [Member] | Implied Volatilities [Member] | Maximum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 166.00%nee_FairValueInputsExpectedRates
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Option Contracts, Power [Member] | Implied Volatilities [Member] | Minimum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 1.00%nee_FairValueInputsExpectedRates
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Options - gas [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure 54us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure 98us-gaap_LiabilitiesFairValueDisclosure
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Options - gas [Member] | Implied Correlations [Member] | Maximum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 98.00%nee_FairValueInputsExpectedRates
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Options - gas [Member] | Implied Correlations [Member] | Minimum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates (4.00%)nee_FairValueInputsExpectedRates
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Options - gas [Member] | Implied Volatilities [Member] | Maximum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 146.00%nee_FairValueInputsExpectedRates
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Options - gas [Member] | Implied Volatilities [Member] | Minimum [Member] | Options Models, Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 1.00%nee_FairValueInputsExpectedRates
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Full Requirements and Unit Contingent Contracts [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Assets, Fair Value Disclosure 394us-gaap_AssetsFairValueDisclosure
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Liabilities, Fair Value Disclosure 37us-gaap_LiabilitiesFairValueDisclosure
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Full Requirements and Unit Contingent Contracts [Member] | Forward Price [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ 184us-gaap_FairValueInputsOfferedQuotes
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Full Requirements and Unit Contingent Contracts [Member] | Forward Price [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Offered Quotes $ (16)us-gaap_FairValueInputsOfferedQuotes
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Full Requirements and Unit Contingent Contracts [Member] | Customer Migration Rate [Member] | Maximum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 20.00%nee_FairValueInputsExpectedRates
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Full Requirements and Unit Contingent Contracts [Member] | Customer Migration Rate [Member] | Minimum [Member] | Discounted Cash Flow Valuation Technique [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value Inputs, Expected Rates 0.00%nee_FairValueInputsExpectedRates
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NEER [Member] | Interest Rate Swap [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Liabilities, Fair Value Disclosure $ 125us-gaap_LiabilitiesFairValueDisclosure
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[1] Applies only to full requirements contracts.