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Debt & Non-recourse Debt - Schedule of Contractual Maturities of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2020 $ 12  
2021 11  
2022 11  
2023 477  
2024 300  
Thereafter 23  
Long-term debt [1] 834 $ 612
Non-recourse Debt    
Debt Instrument [Line Items]    
2020 242  
2021 166  
2022 113  
2023 109  
2024 42  
Thereafter 83  
Long-term debt [2] 755 $ 766
Debt and Non-recourse Debt    
Debt Instrument [Line Items]    
2020 254  
2021 177  
2022 124  
2023 586  
2024 342  
Thereafter 106  
Long-term debt $ 1,589  
[1] As of December 31, 2019 and 2018, weighted-average interest rates were 4.571 percent and 5.170 percent, respectively.
[2] As of December 31, 2019 and 2018, weighted-average interest rates were 2.876 percent and 3.126 percent, respectively