CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Total property, plant and equipment - net	$ 68,659	$ 72,416
Customer receivables, allowances	7	7
Regulatory assets, current	344	336
Regulatory assets, noncurrent	2,503	2,469
Other	3,142	4,719
Long-term debt	28,356	31,463
Current maturities of long-term debt	$ 1,613	$ 1,676
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800	800
Common stock, shares, outstanding (in shares)	472	471
Related to VIEs [Member]
Total property, plant and equipment - net	$ 9,756	$ 16,485
Regulatory assets, current	73	71
Regulatory assets, noncurrent	3	37
Other	0	470
Noncontrolling interest in variable interest entity	3,151	1,006
Long-term debt	1,081	5,941
Current maturities of long-term debt	72	70
FPL [Member]
Customer receivables, allowances	2	2
Regulatory assets, current	344	335
Regulatory assets, noncurrent	2,264	2,249
Other	599	690
Long-term debt	12,379	11,236
Current maturities of long-term debt	$ 92	$ 466
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	0	0
Common stock, shares, outstanding (in shares)	0	0
Common stock, shares, issued (in shares)	0	0
FPL [Member] | Related to VIEs [Member]
Regulatory assets, current	$ 73	$ 71
Regulatory assets, noncurrent	3	37
Long-term debt	35	74
Current maturities of long-term debt	$ 72	$ 70