Segment Information - Reconciliation of Segments Operating Income to Consolidated Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Operating income	$ 7,584	$ 7,796
Other components of net periodic benefit charges	(62)	(172)
Equity in earnings (losses) of unconsolidated businesses	9	(3)
Other income (expense), net	114	(924)
Interest expense	(1,207)	(786)
Income Before Provision For Income Taxes	6,500	6,083
Operating Segments
Segment Reporting Information [Line Items]
Operating income	7,650	7,992
Corporate and other
Segment Reporting Information [Line Items]
Operating income	$ (4)	$ (24)