Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 1,073	$ 1,755	$ 1,697	$ 5,066
Other comprehensive income (loss):
Net unrealized debt securities (losses) gains, net of tax	(9)	3	43	46
Foreign currency translation adjustments, net of tax	40	(59)	(159)	(87)
Net unrealized pension and other postretirement benefits, net of tax	8	1	(19)	(23)
Other comprehensive income (loss)	39	(55)	(135)	(64)
Comprehensive income	$ 1,112	$ 1,700	$ 1,562	$ 5,002