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Employee Benefit Plans Fair Value of Plan Assets by Category (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 86 $ 90
Fair Value, Inputs, Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3 1
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3 1
Fair Value, Inputs, Level 1 | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35 89
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 50
Fair Value, Inputs, Level 2 | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35 39
Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 38  
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Cash and Cash Equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3 1
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 50
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 35 $ 39
Fair Value Measured at Net Asset Value Per Share    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets [1] $ 48  
[1] The fair values of these plan assets were determined using the NAV as a practical expedient and therefore have not been classified in the fair value hierarchy.