Pension And Other Retirement Benefits - Summary of Pension Plan Assets by Category Based on Hierarchy of Fair Value Measurements (Detail) - Pension Plans - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 500	$ 460	$ 449
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets		26
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets		365
Measured using NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total assets		$ 69
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 500
Percent of total assets	100.00%	100.00%
U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 27
U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	398
U.S. Plans | Measured using NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total assets	75
U.S. Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 4	$ 2
Percent of total assets	1.00%	0.00%
U.S. Plans | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 4	$ 2
U.S. Plans | Total equity investments
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 147	$ 139
Percent of total assets	30.00%	30.00%
U.S. Plans | Total equity investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 147	$ 139
U.S. Plans | U.S. large-cap
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 119	$ 114
Percent of total assets	24.00%	25.00%
U.S. Plans | U.S. large-cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 119	$ 114
U.S. Plans | U.S. small and mid-cap
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 28	$ 25
Percent of total assets	6.00%	5.00%
U.S. Plans | U.S. small and mid-cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 28	$ 25
U.S. Plans | Total fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 325	$ 295
Percent of total assets	64.00%	65.00%
U.S. Plans | Total fixed-income investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 27	$ 26
U.S. Plans | Total fixed-income investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	247	224
U.S. Plans | Total fixed-income investments | Measured using NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total assets	51	45
U.S. Plans | Emerging markets bond fund
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 35	$ 30
Percent of total assets	7.00%	7.00%
U.S. Plans | Emerging markets bond fund | Measured using NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 35	$ 30
U.S. Plans | Intermediate-term investment grade U.S. government/ corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 64	$ 57
Percent of total assets	13.00%	12.00%
U.S. Plans | Intermediate-term investment grade U.S. government/ corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 64	$ 57
U.S. Plans | Long duration corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 157	$ 146
Percent of total assets	31.00%	32.00%
U.S. Plans | Long duration corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 157	$ 146
U.S. Plans | U.S. Treasury Inflation-Protected Securities (TIPs)
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 27	$ 26
Percent of total assets	5.00%	6.00%
U.S. Plans | U.S. Treasury Inflation-Protected Securities (TIPs) | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 27	$ 26
U.S. Plans | Emerging markets equity
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 26	$ 21
Percent of total assets	5.00%	5.00%
U.S. Plans | Emerging markets equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 26	$ 21
U.S. Plans | Private investment fund—high yield securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 16	$ 15
Percent of total assets	3.00%	3.00%
U.S. Plans | Private investment fund—high yield securities | Measured using NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 16	$ 15
U.S. Plans | Other investment—private real estate fund
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 24	$ 24
Percent of total assets	5.00%	5.00%
U.S. Plans | Other investment—private real estate fund | Measured using NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 24	$ 24