Derivative Instruments (Balance Sheet Disclosure) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	$ 1,661		$ 1,437
Derivative Liabilities	1,311		1,017
Current derivative assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	498	[1]	517	[2]
Derivative Asset, Fair Value, Amount Offset Against Collateral	181		43
Non Current Derivative Assets Member [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	1,163	[3]	920	[4]
Derivative Asset, Fair Value, Amount Offset Against Collateral	98		159
Current derivative liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Liabilities	838		430	[5]
Derivative Liability, Fair Value, Amount Offset Against Collateral			79
Noncurrent derivative liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Liabilities	473		587
Commodity contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	1,571		1,361
Derivative Liabilities	940		564
Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	90		76
Derivative Liabilities	220		387
Foreign currency swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	0		0
Derivative Liabilities	151		66
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	4,544		4,232
Derivative Liability, Fair Value, Gross Liability	3,827		3,345
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	4,543		4,232
Derivative Liability, Fair Value, Gross Liability	3,633		3,312
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	1		0
Derivative Liability, Fair Value, Gross Liability	93		0
Not Designated as Hedging Instrument [Member] | Foreign currency swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Gross Liability	101		33
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	89		76
Derivative Liability, Fair Value, Gross Liability	177		420
Designated as Hedging Instrument [Member] | Commodity contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Gross Liability	0		0
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	89		76
Derivative Liability, Fair Value, Gross Liability	127		387
Designated as Hedging Instrument [Member] | Foreign currency swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Gross Liability	50		33
FPL [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	48		5
Derivative Liabilities	2		20
FPL [Member] | Current other assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	48		4
FPL [Member] | Non Current Other Assets Member
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets			1
FPL [Member] | Current other liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Liabilities	1		20
FPL [Member] | Noncurrent other liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Liabilities	1
FPL [Member] | Commodity contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Assets	48		5
Derivative Liabilities	2		20
FPL [Member] | Not Designated as Hedging Instrument [Member] | Commodity contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	55		17
Derivative Liability, Fair Value, Gross Liability	9		32
FPL [Member] | Designated as Hedging Instrument [Member] | Commodity contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Abstract]
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Gross Liability	$ 0		$ 0

[1] Reflects the netting of approximately $181 million in margin cash collateral received from counterparties.

[2] Reflects the netting of approximately $43 million in margin cash collateral received from counterparties.

[3] Reflects the netting of approximately $98 million in margin cash collateral received from counterparties.

[4] Reflects the netting of approximately $159 million in margin cash collateral received from counterparties.

[5] Reflects the netting of approximately $79 million in margin cash collateral provided to counterparties.