Schedule I Condensed Financial Statements (Parent Company Only) - Notes (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Feb. 28, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Tax equity contributions		$ 0	$ 2,736	$ 1,619
BYD Company Limited common stock
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
BYD Company Limited common stock		7,693	5,897
Parent Company
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Proceeds from dividends received		2,400	2,000	$ 2,000
Guarantor obligation		1,400
Tax equity contributions		356
Parent Company | Subsequent event
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
Proceeds from dividends received	$ 102
Parent Company | BYD Company Limited common stock
Investments, Including Equity Method And Restricted Cash And Investments [Line Items]
BYD Company Limited common stock		$ 0	$ 5,897