Investments - Total Investment Schedule (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Total Investments [Line Items]
Current	$ 2,792	$ 3,117
Long-term	20,583	23,025
Total	23,375	26,142
Disposal Group, Held-for-sale, Not Discontinued Operations
Total Investments [Line Items]
Long-term	18
Debt securities available for sale
Total Investments [Line Items]
Current	2,729	3,009
Long-term	17,311	20,231
Total	20,040	23,240
Mortgage loans
Total Investments [Line Items]
Current	58	58
Long-term	989	844
Total	1,047	902
Other investments
Total Investments [Line Items]
Current	5	50
Long-term	2,283	1,950
Total	$ 2,288	$ 2,000