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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Assets $ 1,919 $ 1,804
Derivative Liability, Current 675 364 [1]
Derivative Liability, Noncurrent 516 535 [1]
Derivative Liabilities 1,191 899
Derivative Asset, Current 564 489 [1]
Derivative Asset, Noncurrent 1,355 1,315 [1]
Current derivative assets [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Margin cash collateral received from counterparties 124 39
Non Current Derivative Assets Member [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Margin cash collateral received from counterparties 65  
Noncurrent derivative liabilities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Margin cash collateral paid to counterparties   39
Not Designated as Hedging Instrument [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Asset, Fair Value, Gross Asset 4,724 4,012
Derivative Liability, Fair Value, Gross Liability 3,807 3,107
Derivative Assets 1,919 1,804
Derivative Liabilities 1,191 899
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Asset, Fair Value, Gross Asset 4,651 3,962
Derivative Liability, Fair Value, Gross Liability 3,305 2,792
Derivative Assets 1,840 1,737
Derivative Liabilities 683 567
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Asset, Fair Value, Gross Asset 56 50
Derivative Liability, Fair Value, Gross Liability 472 275
Derivative Assets 49 55
Derivative Liabilities 465 280
Not Designated as Hedging Instrument [Member] | Foreign currency contracts [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Asset, Fair Value, Gross Asset 17 0
Derivative Liability, Fair Value, Gross Liability 30 40
Derivative Assets 30 12
Derivative Liabilities 43 52
FPL[Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Assets 0 2
Derivative Liabilities 41 2
FPL[Member] | Current other assets [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Asset, Current   2
FPL[Member] | Other Current Liabilities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Liability, Current 32 2
FPL[Member] | Other Noncurrent Liabilities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Liability, Noncurrent 9  
FPL[Member] | Not Designated as Hedging Instrument [Member] | Commodity contracts [Member]    
Derivative Instruments and Hedging Activities Disclosures [Abstract]    
Derivative Asset, Fair Value, Gross Asset 2 3
Derivative Liability, Fair Value, Gross Liability 43 3
Derivative Assets 0 2
Derivative Liabilities $ 41 $ 2
[1] Amounts have been retrospectively adjusted as discussed in Note 14.