Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax liabilities:
Property-related	$ 10,018	$ 10,065
Pension	564	437
Investments in partnerships and joint ventures	2,783	2,238
Other	2,092	1,730
Total deferred tax liabilities	15,457	14,470
Deferred tax assets and valuation allowance:
Decommissioning reserves	296	290
Net operating loss carryforwards	330	299
Tax credit carryforwards	4,646	3,859
ARO and accrued asset removal costs	199	347
Regulatory liabilities	1,421	1,380
Other	733	755
Valuation allowance	(282)	(289)
Net deferred tax assets	7,343	6,641
Net deferred income taxes	8,114	7,829
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract]
Noncurrent other assets	196	191
Deferred income taxes – noncurrent liabilities	(8,310)	(8,020)
Net deferred income taxes	(8,114)	(7,829)
FPL [Member]
Deferred tax liabilities:
Property-related	7,831	7,548
Pension	425	394
Investments in partnerships and joint ventures	3	3
Other	1,232	862
Total deferred tax liabilities	9,491	8,807
Deferred tax assets and valuation allowance:
Decommissioning reserves	296	290
Net operating loss carryforwards	2	3
Tax credit carryforwards	182	4
ARO and accrued asset removal costs	126	272
Regulatory liabilities	1,397	1,356
Other	351	363
Valuation allowance	0	0
Net deferred tax assets	2,354	2,288
Net deferred income taxes	7,137	6,519
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract]
Noncurrent other assets	0	0
Deferred income taxes – noncurrent liabilities	(7,137)	(6,519)	[1]
Net deferred income taxes	$ (7,137)	$ (6,519)

[1] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 6 – Merger of FPL and Gulf Power Company.