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Leases - Narrative (Details)
$ in Millions
Jun. 30, 2020
USD ($)
renewal_option
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Lease liability $ 267 $ 234
Right of use assets, net $ 257 $ 223
Oahu Solar Partnership    
Lessee, Lease, Description [Line Items]    
Lease period   35 years
Number of renewal options | renewal_option 2  
Renewal period 5 years  
Lease liability $ 20 $ 21
Right of use assets, net $ 18 $ 19