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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 6,321	$ 6,667	$ 8,005
Other comprehensive income, net of tax (Note 20)
Foreign currency translation adjustments and other	(523)	(6)	(715)
Defined benefit plans	(1,795)	(2,122)	(221)
Other comprehensive loss, net of tax	(2,318)	(2,128)	(936)
Comprehensive income	4,003	4,539	7,069
Comprehensive loss attributable to noncontrolling interests	92	76	15
Comprehensive income attributable to stockholders	$ 4,095	$ 4,615	$ 7,084

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