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Fair Value Measurements - Schedule of Fair Value of Investment Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value $ 196 $ 164
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Amortized Cost 201 156
Level 1 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 89 75
Level 1 | Fair Value | Fixed Income Mutual Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 89 75
Level 1 | Fair Value | Corporate Bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 0 0
Level 1 | Fair Value | Government Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 0 0
Level 2 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 107 89
Level 2 | Fair Value | Fixed Income Mutual Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 0 0
Level 2 | Fair Value | Corporate Bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 49 63
Level 2 | Fair Value | Government Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 58 26
Total | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 196 164
Total | Fair Value | Fixed Income Mutual Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 89 75
Total | Fair Value | Corporate Bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value 49 63
Total | Fair Value | Government Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total Investments at Fair Value $ 58 $ 26