CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Total property, plant and equipment - net	$ 72,416	$ 66,912
Customer receivables, net of allowances	7	5
Other investments ($470 and $479 related to a VIE, respectively)	2,959	2,482
Regulatory assets ($37 and $107 related to a VIE, respectively)	$ 2,469	$ 1,894
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized (in shares)	800,000,000	800,000,000
Common stock, outstanding (in shares)	471,000,000	468,000,000
Long-term debt	$ 31,463	$ 27,818
Related to VIEs [Member]
Total property, plant and equipment - net	16,485	14,632
Other investments ($470 and $479 related to a VIE, respectively)	470	479
Regulatory assets ($37 and $107 related to a VIE, respectively)	37	107
Long-term debt	5,941	5,080
FPL[Member]
Customer receivables, net of allowances	2	2
Regulatory assets ($37 and $107 related to a VIE, respectively)	$ 2,249	$ 1,573
Common stock, authorized (in shares)	1,000	1,000
Common stock, par value	$ 0	$ 0
Common stock, issued (in shares)	1,000	1,000
Common stock, outstanding (in shares)	1,000	1,000
Long-term debt	$ 11,236	$ 9,705
FPL[Member] | Related to VIEs [Member]
Regulatory assets ($37 and $107 related to a VIE, respectively)	37	107
Long-term debt	$ 74	$ 144