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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 3,014	$ 286
Other comprehensive income (loss), net of tax (Note 16)
Foreign currency translation adjustments and other	(5)	(973)
Defined benefit plans	160	317
Other comprehensive income (loss), net of tax	155	(656)
Comprehensive income (loss)	3,169	(370)
Comprehensive loss attributable to noncontrolling interests	15	20
Comprehensive income (loss) attributable to stockholders	$ 3,184	$ (350)

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