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Common Shareholders' Equity (Issuance of Common Stock and Forward Sale Agreement) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended
Nov. 30, 2013
Dec. 31, 2014
Class of Stock [Line Items]    
Stock sold during the period 4,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Share Price 88.03us-gaap_SharePrice  
Forward Counterparty [Member]    
Class of Stock [Line Items]    
Stock sold during the period 6,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CounterpartyNameAxis
= nee_ForwardCounterpartyMember		  
Shares delivered   6,600,000nee_AcceleratedShareRepurchasesSharesDelivered
/ us-gaap_CounterpartyNameAxis
= nee_ForwardCounterpartyMember
Proceeds from Equity   $ 552us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
/ us-gaap_CounterpartyNameAxis
= nee_ForwardCounterpartyMember