Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2017

Asset Retirement Obligations [Abstract]

Asset retirement obligation, roll forward analysis

A rollforward of NEE's and FPL's AROs is as follows:

	FPL		NEER				NEE
			(millions)
Balances, December 31, 2015	$	1,822	$	647			$	2,469
Liabilities incurred	1		56				57
Accretion expense	91		47				138
Liabilities settled	—		(2		)		(2		)
Revision in estimated cash flows - net	5		69			(a)	74
Balances, December 31, 2016	1,919		817				2,736
Liabilities incurred	17		59				76
Accretion expense	96		52				148
Liabilities settled	—		(14		)	(b)	(14		)
Revision in estimated cash flows - net	15		70			(c)	85
Balances, December 31, 2017	$	2,047	$	984			$	3,031

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(a) Primarily reflects the effect of revised cost estimates to dismantle certain of NEER’s wind and solar facilities.

(b) Includes approximately $13 million reclassified to liabilities associated with assets held for sale in NEE's consolidated balance sheets. See Note 1 - Assets and Liabilities Associated with Assets Held for Sale.

(c) Primarily reflects the effect of the revised cost estimate due to the change in useful life of Duane Arnold. See Note 4 - Nonrecurring Fair Value Measurements

Funds restricted for decommissioning included in special use funds

Restricted funds for the payment of future expenditures to decommission NEE's and FPL's nuclear units included in special use funds on NEE's and FPL's consolidated balance sheets are as follows (see Note 4 - Special Use Funds):

	FPL		NEER		NEE
			(millions)
Balances, December 31, 2017	$	4,090	$	1,913	$	6,003
Balances, December 31, 2016	$	3,665	$	1,769	$	5,434