Condensed Financial Information of the Parent Company - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Interest paid	$ 363	$ 731	$ 1,251
Key
Condensed Financial Statements, Captions [Line Items]
Interest paid	$ 130	$ 204	$ 151