Taxes - Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Balance at January 1,	$ 2,705	$ 2,812	$ 3,134
Additions based on tax positions related to the current year	91	114	123
Additions for tax positions of prior years	203	185	122
Reductions for tax positions of prior years	(229)	(154)	(419)
Settlements	(70)	(50)	(92)
Lapses of statutes of limitations	(65)	(202)	(56)
Balance at December 31,	$ 2,635	$ 2,705	$ 2,812