Investments - Debt Securities by Contractual Maturity Periods (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 796
Due after one year through five years	4,978
Due after five years through ten years	4,967
Due after ten years	4,163
Mortgage and other asset-backed securities	413
Total	15,317	$ 15,775
Fair Value
Due in one year or less	799
Due after one year through five years	4,948
Due after five years through ten years	4,859
Due after ten years	4,410
Mortgage and other asset-backed securities	398
Total	$ 15,414