Schedule I Condensed Financial Statements (Parent Company Only) - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net income	$ 6,189	$ 7,014	$ 2,968
Other comprehensive income, net of tax	217	154	239
Comprehensive income	6,406	7,168	3,207
Comprehensive income attributable to noncontrolling interests	404	71	18
Comprehensive income (loss) attributable to parent	6,002	7,097	3,189
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income	5,790	6,944	2,954
Other comprehensive income, net of tax	212	154	239
Comprehensive income	6,002	7,098	3,193
Comprehensive income attributable to noncontrolling interests	0	1	3
Comprehensive income (loss) attributable to parent	$ 6,002	$ 7,097	$ 3,190