CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Total property, plant and equipment - net	$ 68,572	$ 72,416
Customer receivables, allowances	12	7
Regulatory assets, current	399	336
Regulatory assets, noncurrent	2,396	2,469
Other	3,548	4,719
Long-term debt	27,048	31,463
Current maturities of long-term debt	$ 2,649	$ 1,676
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares, outstanding (in shares)	478,000,000	471,000,000
Related to VIEs [Member]
Total property, plant and equipment - net	$ 9,686	$ 16,485
Regulatory assets, current	61	71
Regulatory assets, noncurrent	0	37
Other	0	470
Noncontrolling interest in variable interest entity	3,080	1,006
Long-term debt	1,020	5,941
Current maturities of long-term debt	74	70
FPL [Member]
Customer receivables, allowances	5	2
Regulatory assets, current	399	335
Regulatory assets, noncurrent	2,168	2,249
Other	855	690
Long-term debt	11,595	11,236
Current maturities of long-term debt	$ 96	$ 466
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	1,000	1,000
Common stock, shares, outstanding (in shares)	1,000	1,000
Common stock, shares, issued (in shares)	1,000	1,000
FPL [Member] | Related to VIEs [Member]
Regulatory assets, current	$ 61	$ 71
Regulatory assets, noncurrent	0	37
Long-term debt	0	74
Current maturities of long-term debt	$ 74	$ 70