Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 2,403	$ 2,366	$ 4,548	$ 3,406
Other comprehensive income (loss), net of tax (Note 16)
Foreign currency translation adjustments and other	68	(328)	217	(294)
Defined benefit plans	6	234	42	227
Other comprehensive income (loss), net of tax	74	(94)	259	(67)
Comprehensive income	2,477	2,272	4,807	3,339
Comprehensive loss attributable to noncontrolling interests	20	28	37	35
Comprehensive income attributable to stockholders	$ 2,497	$ 2,300	$ 4,844	$ 3,374