Taxes - Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1,	$ 3,134	$ 2,944	$ 2,870
Additions based on tax positions related to the current year	123	150	160
Additions for tax positions of prior years	122	621	258
Reductions for tax positions of prior years	(419)	(330)	(166)
Settlements	(92)	(163)	(46)
Lapses of statutes of limitations	(56)	(88)	(132)
Balance at December 31,	$ 2,812	$ 3,134	$ 2,944