Investments - Schedule of Contractual Maturities of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Amortized cost
Due in one year or less	$ 645
Due after one year through five years	3,721
Due after five years through ten years	3,519
Due after ten years	4,612
Total	12,497	$ 12,230
Fair value
Due in one year or less	645
Due after one year through five years	3,670
Due after five years through ten years	3,416
Due after ten years	4,202
Total	$ 11,933	$ 13,022
% of fair value
Due in one year or less	5.40%
Due after one year through five years	30.80%
Due after five years through ten years	28.60%
Due after ten years	35.20%
Total	100.00%