Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets	$ 2,470	$ 2,386
Derivative Asset, Current	708	762
Derivative Asset, Noncurrent	1,762	1,624
Derivative liability	2,052	1,340
Derivative Liability, Current	337	344
Derivative Liability, Noncurrent	1,715	863
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities Associated with Assets Held-for-Sale		133
Current derivative assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	2
Non Current Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	202	139
Noncurrent derivative liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	75	66
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	5,511	5,102
Derivative liability, fair value, gross liability	4,965	3,981
Derivative assets	2,470	2,386
Derivative liability	2,052	1,340
Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	5,473	5,050
Derivative liability, fair value, gross liability	3,428	3,201
Derivative assets	2,463	2,350
Derivative liability	546	576
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	38	26
Derivative liability, fair value, gross liability	1,470	742
Derivative assets	8	9
Derivative liability	1,440	725
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	0	26
Derivative liability, fair value, gross liability	67	38
Derivative assets	(1)	27
Derivative liability	66	39
FPL [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2	3
Derivative liability	11	13
FPL [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	2	3
FPL [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	11	12
FPL [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability		1
FPL [Member] \| Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	4	4
Derivative liability, fair value, gross liability	13	14
Derivative assets	2	3
Derivative liability	$ 11	$ 13

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