Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 6,189	$ 7,014	$ 2,968
Other comprehensive (loss) income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	174	(65)	(59)
Foreign currency translation adjustment	(24)	234	327
Unrealized gains (losses) on cash flow hedges, net of tax	67	(15)	(29)
Total other comprehensive (loss) income, net of tax	217	154	239
Comprehensive income	6,406	7,168	3,207
Comprehensive income attributable to noncontrolling interests	404	71	18
Comprehensive income (loss) attributable to parent	$ 6,002	$ 7,097	$ 3,189