v3.20.4
Debt - Solar Bonds and other Loans - Additional Information (Detail) - 5.50% Convertible Senior Notes due in 2022 [Member] - Senior Notes
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Interest Rate 5.50%
Debt instrument convertible, if-converted value in excess of principal $ 447