Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Amortized cost, net
Due in one year or less	$ 3,694	$ 2,870
Due after one year through five years	24,428	26,546
Due after five years through ten years	12,231	11,035
Due after ten years	6,549	3,731
Subtotal	46,902	44,182
ABS	1,002	1,188
Amortized cost, net	47,904	45,370
Fair value
Due in one year or less	3,626	2,836
Due after one year through five years	23,235	25,217
Due after five years through ten years	11,401	9,870
Due after ten years	6,305	3,405
Subtotal	44,567	41,328
ABS	983	1,157
Total	$ 45,550	$ 42,485