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Pension And Other Retirement Benefits - Summary of Pension Plan Assets by Category Based on Hierarchy of Fair Value Measurements (Detail) - Pension Plans - U.S. Plans - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 460 $ 449 $ 420
Percent of total assets 100.00% 100.00%  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 26 $ 25  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 365 356  
Measured using NAV practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 69 68  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 2 $ 5  
Percent of total assets 0.00% 1.00%  
Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 2 $ 5  
Total equity investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 139 $ 147  
Percent of total assets 30.00% 33.00%  
Total equity investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 139 $ 147  
U.S. large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 114 $ 106  
Percent of total assets 25.00% 24.00%  
U.S. large-cap | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 114 $ 106  
U.S. small and mid-cap      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 25 $ 21  
Percent of total assets 5.00% 5.00%  
U.S. small and mid-cap | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 25 $ 21  
Emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Total assets   $ 20  
Percent of total assets   4.00%  
Emerging markets | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets   $ 20  
Total fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 295 $ 272  
Percent of total assets 65.00% 60.00%  
Total fixed-income investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 26 $ 25  
Total fixed-income investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 224 204  
Total fixed-income investments | Measured using NAV practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total assets 45 43  
Emerging markets bond fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 30 $ 29  
Percent of total assets 7.00% 6.00%  
Emerging markets bond fund | Measured using NAV practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 30 $ 29  
Intermediate-term investment grade U.S. government/ corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 57 $ 60  
Percent of total assets 12.00% 13.00%  
Intermediate-term investment grade U.S. government/ corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 57 $ 60  
Long duration corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 146 $ 144  
Percent of total assets 32.00% 32.00%  
Long duration corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 146 $ 144  
U.S. Treasury Inflation-Protected Securities (TIPs)      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 26 $ 25  
Percent of total assets 6.00% 6.00%  
U.S. Treasury Inflation-Protected Securities (TIPs) | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 26 $ 25  
Emerging markets equity mutual fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 21    
Percent of total assets 5.00%    
Emerging markets equity mutual fund | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 21    
Private investment fund—high yield securities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 15 $ 14  
Percent of total assets 3.00% 3.00%  
Private investment fund—high yield securities | Measured using NAV practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 15 $ 14  
Other investment—private real estate fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 24 $ 25  
Percent of total assets 5.00% 6.00%  
Other investment—private real estate fund | Measured using NAV practical expedient      
Defined Benefit Plan Disclosure [Line Items]      
Total assets $ 24 $ 25