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Fair Value - Held to Maturity Investment Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Carrying Value    
Schedule of Held-to-Maturity Securities [Line Items]    
Held-to-maturity investment securities $ 215 $ 234
Fair Value    
Schedule of Held-to-Maturity Securities [Line Items]    
Held-to-maturity investment securities $ 212 $ 231