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Debt & Non-recourse Debt - Schedule of Contractual Maturities of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 12  
2022 11  
2023 818  
2024 300  
Thereafter 23  
Long-term debt [1] 1,164 $ 834
Non-recourse Debt    
Debt Instrument [Line Items]    
2021 283  
2022 132  
2023 129  
2024 66  
2025 108  
Thereafter 57  
Long-term debt [2] 775 $ 755
Debt and Non-recourse Debt    
Debt Instrument [Line Items]    
2021 295  
2022 143  
2023 947  
2024 366  
2025 108  
Thereafter 80  
Long-term debt $ 1,939  
[1] As of December 31, 2020 and 2019, weighted-average interest rates were 3.357 percent and 4.571 percent, respectively.
[2] As of December 31, 2020 and 2019, weighted-average interest rates were 3.173 percent and 2.876 percent, respectively