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Retirement Plans and Profit Sharing Arrangements - Pension Plan Assets Measured at Fair Value on a Recurring Basis (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets $ 1,253 $ 1,292 $ 1,142
Level 1      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 115 180  
Level 2      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 6 7  
Level 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 21 23  
U.S. small cap stocks | Total, Level 1, 2 and 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 52 97  
U.S. small cap stocks | Level 1      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 46 90  
U.S. small cap stocks | Level 2      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 6 7  
U.S. small cap stocks | Level 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 0 0  
Registered investment companies | Total, Level 1, 2 and 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 69 90  
Registered investment companies | Level 1      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 69 90  
Registered investment companies | Level 2      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 0 0  
Registered investment companies | Level 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 0 0  
Insurance contracts | Total, Level 1, 2 and 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 21 23  
Insurance contracts | Level 1      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 0 0  
Insurance contracts | Level 2      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 0 0  
Insurance contracts | Level 3      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 21 23  
Cash equivalents | NAV      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 7 3  
Collective investment funds | NAV      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 1,057 859  
Real estate investment trusts | NAV      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets 20 28  
Hedge funds | NAV      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets $ 27 24  
Pooled pension funds at NAV | NAV      
Pension plan assets measured at fair value on a recurring basis:      
Fair value of plan assets   $ 168