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Common Shareholders' Equity (Accumulated Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss) $ (40)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 56us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (255)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (154)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (156)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax 259us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 58us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax 52us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax    
Other comprehensive income (loss) (98)us-gaap_OtherComprehensiveIncomeLossNetOfTax 311us-gaap_OtherComprehensiveIncomeLossNetOfTax (101)us-gaap_OtherComprehensiveIncomeLossNetOfTax  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest      
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss) (156)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (141)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Other comprehensive income (loss) (43)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
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Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss) 218us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 62us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Other comprehensive income (loss) 21us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
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Accumulated Defined Benefit Plans Adjustment [Member]        
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss) (20)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other comprehensive income (loss) (43)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
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Accumulated Translation Adjustment [Member]        
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss) (58)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (25)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other comprehensive income (loss) (25)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
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Other ComprehesiveIncomeEquityMethod [Member]        
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]        
Accumulated other comprehensive income (loss) (24)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (8)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Other comprehensive income (loss) (8)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest $ 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
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[1] Reclassified to interest expense and other - net in NEE's consolidated statements of income. See Note 3 - Income Statement Impact of Derivative Instruments.
[2] Reclassified to gains on disposal of assets - net in NEE's consolidated statements of income.