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Credit facilities - Schedule of Minimum Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Total non-recourse debt $ 442 $ 593
Credit Facilities | Approval-Based Facility    
Line of Credit Facility [Line Items]    
July 1, 2021 to December 31, 2021 0  
2022 4  
2023 15  
Total non-recourse debt $ 19