Consolidated Statements of Comprehensive Income (Unaudited) - 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	$ 2,025	$ 2,846	$ 4,518	$ 4,639
Other comprehensive (loss) income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	22	(6)	44	38
Foreign currency translation adjustment	(218)	244	(59)	(195)
Unrealized gains (losses) on cash flow hedges, net of tax	33	4	48	(20)
Total other comprehensive (loss) income, net of tax	(163)	242	33	(177)
Comprehensive income	1,862	3,088	4,551	4,462
Comprehensive income attributable to noncontrolling interests	103	4	315	11
Comprehensive income (loss) attributable to parent	$ 1,759	$ 3,084	$ 4,236	$ 4,451