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Proposed Merger (Details)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended
Jul. 16, 2016
USD ($)
May 31, 2016
application
Jan. 21, 2015
application
Sep. 30, 2016
USD ($)
Business Acquisition [Line Items]        
Number of related applications | application   2    
Number of purported class action complaints filed | application     3  
NextEra Energy, Inc Merger        
Business Acquisition [Line Items]        
Merger contract termination fee $ 90      
Maximum expenses paid to party for cancellation of merger $ 5      
Net income recognized on merger termination       $ 64
Net income recognized, merger termination fee       55
Net income recognized, merger termination, reimbursements and insurance       3
Recognition of previously disallowed merger expenses       8
Net income recognized, merger and spin-off related expenses       $ 2