Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,755	$ 1,654	$ 5,066	$ 4,911
Other comprehensive loss:
Net unrealized debt securities gains (losses), net of tax	3	(11)	46	(29)
Foreign currency translation adjustments, net of tax	(59)	(19)	(87)	(85)
Net unrealized pension and other postretirement benefits, net of tax	1	9	(23)	38
Other comprehensive loss	(55)	(21)	(64)	(76)
Comprehensive income	$ 1,700	$ 1,633	$ 5,002	$ 4,835