Investments - Total Investment Schedule (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Total Investments [Line Items]
Current	$ 3,080	$ 2,778
Long-term	22,114	21,113
Total	25,194	23,891
Disposal Group, Held-for-sale, Not Discontinued Operations
Total Investments [Line Items]
Long-term		17
Debt securities available for sale
Total Investments [Line Items]
Current	2,988	2,718
Long-term	17,915	17,562
Total	20,903	20,280
Mortgage loans
Total Investments [Line Items]
Current	90	55
Long-term	1,143	989
Total	1,233	1,044
Other investments
Total Investments [Line Items]
Current	2	5
Long-term	3,056	2,562
Total	$ 3,058	$ 2,567