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Business segment data - Reconciliations of Revenues and Earnings before income taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenues	$ 94,972	$ 92,995	$ 277,212	$ 276,517
Investment gains (losses)	21,939	20,514	21,868	46,247
Equity method investments	330	222	(4,289)	967
Earnings before income taxes	38,105	32,508	58,003	86,351
Operating Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	94,237	92,809	274,998	276,165
Earnings before income taxes	14,424	12,949	39,417	38,737
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Investment gains (losses)	21,939	20,514	21,868	46,247
Equity method investments	330	222	(4,289)	967
Corporate, Eliminations and Other [Member]
Segment Reporting Information [Line Items]
Revenues	735	186	2,214	352
Earnings before income taxes from operating businesses	$ 1,412	$ (1,177)	$ 1,007	$ 400

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