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Fair Value Measurements - Investment Maturities (Details) - Fair Value - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Less than 1 year $ 96 $ 77
1 - 5 years 26 28
5 - 10 years 10 12
Greater than 10 years 42 47
Total investments at fair value $ 174 $ 164