Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative assets	$ 2,951	$ 1,824
Derivative Asset, Current	1,392	689
Derivative Asset, Noncurrent	1,559	1,135
Derivative liability	5,285	2,976
Derivative Liability, Current	2,856	1,263
Derivative Liability, Noncurrent	2,429	1,713
Current Derivative Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	573	150
Non Current Derivative Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	74	56
Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	87	6
Non Current derivative liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	985	172
Commodity contracts | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2,757	1,757
Derivative liability	4,875	2,198
Derivative asset, netting	(12,708)	(6,622)
Derivative liability, netting	(13,133)	(6,594)
Commodity contracts | Level 1 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	4,327	1,896
Derivative Liability, Gross Liability	5,926	2,571
Commodity contracts | Level 2 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	9,170	5,082
Derivative Liability, Gross Liability	9,042	4,990
Commodity contracts | Level 3 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	1,968	1,401
Derivative Liability, Gross Liability	3,040	1,231
Interest rate contracts | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	210	76
Derivative liability	354	709
Derivative asset, netting	(33)	(30)
Derivative liability, netting	(33)	(30)
Interest rate contracts | Level 1 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	0	0
Derivative Liability, Gross Liability	0	0
Interest rate contracts | Level 2 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	243	106
Derivative Liability, Gross Liability	387	739
Interest rate contracts | Level 3 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	0	0
Derivative Liability, Gross Liability	0	0
Foreign currency contracts | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	(16)	(9)
Derivative liability	56	69
Derivative asset, netting	(37)	(17)
Derivative liability, netting	(37)	(17)
Foreign currency contracts | Level 1 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	0	0
Derivative Liability, Gross Liability	0	0
Foreign currency contracts | Level 2 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	21	8
Derivative Liability, Gross Liability	93	86
Foreign currency contracts | Level 3 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	0	0
Derivative Liability, Gross Liability	0	0
Florida Power & Light Company
Derivatives, Fair Value [Line Items]
Derivative liability		10
Florida Power & Light Company | Current other assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	6	13
Florida Power & Light Company | Current other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	14	9
Florida Power & Light Company | Noncurrent other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Noncurrent		1
Florida Power & Light Company | Commodity contracts | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	6	13
Derivative liability	14	10
Derivative asset, netting	(9)	(3)
Derivative liability, netting	(9)	(3)
Florida Power & Light Company | Commodity contracts | Level 1 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	0	0
Derivative Liability, Gross Liability	0	0
Florida Power & Light Company | Commodity contracts | Level 2 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	8	3
Derivative Liability, Gross Liability	6	8
Florida Power & Light Company | Commodity contracts | Level 3 | Fair value measurements made on a recurring basis [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross Asset	7	13
Derivative Liability, Gross Liability	$ 17	$ 5