Employee Benefit Plans (Change in Accumulated Other Comprehensive Loss (Pretax) Relating to Defined Benefit Pension and Other Postretirement Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain arising during the year	$ (43)
New prior service cost	0
Amortization of actuarial loss	20	$ 15	$ 8
Amortization of prior service credit	54	59	57
Foreign currency translation adjustments	0
Impact of settlements	0
Net decrease	(9)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain arising during the year	(119)
New prior service cost	1
Amortization of actuarial loss	39	$ 71	$ 62
Amortization of prior service credit	0
Foreign currency translation adjustments	(3)
Impact of settlements	(53)
Net decrease	$ (213)