Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,826	$ 1,073	$ 6,341	$ 1,697
Other comprehensive income (loss):
Net unrealized debt securities (losses) gains, net of tax	(8)	(9)	(31)	43
Foreign currency translation adjustments, net of tax	(83)	40	(81)	(159)
Net unrealized pension and other postretirement benefits, net of tax	9	8	44	(19)
Other comprehensive income (loss)	(82)	39	(68)	(135)
Comprehensive income	$ 1,744	$ 1,112	$ 6,273	$ 1,562