Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 8,060	$ 3,135	$ 6,759
Other comprehensive (loss) income:
Net unrealized debt securities gains (losses), net of tax	(42)	32	41
Foreign currency translation adjustments, net of tax	(163)	(40)	(56)
Net unrealized pension and other postretirement benefits, net of tax	155	(150)	(125)
Other comprehensive (loss) income	(50)	(158)	(140)
Comprehensive income	$ 8,010	$ 2,977	$ 6,619