Employee Benefit Plans (Change in Fair Value of Company's Level 3 Pension Assets) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 1,974
End balance	1,729	$ 1,974
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	677	954
Realized gains/(losses)	0	(99)
Unrealized gains	2	3
Transfers in/(out), net	(115)	(122)
Foreign currency losses	35	(59)
End balance	599	677
Level 3 | Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	149	157
Realized gains/(losses)	4	1
Unrealized gains	(19)	6
Transfers in/(out), net	(17)	(10)
Foreign currency losses	2	(5)
End balance	119	149
Level 3 | Other Debt Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	235	367
Realized gains/(losses)	25	(99)
Unrealized gains	0	0
Transfers in/(out), net	(9)	(12)
Foreign currency losses	7	(21)
End balance	258	235
Level 3 | Hedge Funds and Other Assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	293	430
Realized gains/(losses)	(29)	(1)
Unrealized gains	21	(3)
Transfers in/(out), net	(89)	(100)
Foreign currency losses	26	(33)
End balance	$ 222	$ 293