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Summary of Significant Accounting and Reporting Policies (Tables)
 9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Changes in noncontrolling interest balance
The following table reflects the changes in NEP's noncontrolling interest balance:
 
Nine Months Ended September 30,
 
2015
 
2014(a)
 
(millions)
Noncontrolling interest at December 31, 2014(b) and December 31, 2013
$
732

 
$
—

Payments to NEE for acquisitions of projects
(716
)
 
(288
)
NEE purchase of NEP OpCo's common units
702


—

Cash distributions
(47
)
 
—

Noncash distributions
(7
)
 
—

Member contributions, net(c)
103

 
1,372

Comprehensive income attributable to noncontrolling interest, including pre-acquisition net income of the 2015 acquisitions
21

 
14

Noncash member contribution upon transition from predecessor method
3

 
(60
)
Noncontrolling interest at September 30
$
791

 
$
1,038

____________________
(a)
Prior-period financial information has been retrospectively adjusted as discussed in Note 2.
(b)
As reported in the 2014 Consolidated Financial Statements.
(c)
For 2015, primarily construction-related contributions between January 1, 2015 and the respective acquisition dates.