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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,015 | $ 3,000
Long-term | 22,370 | 20,812
Total | 25,385 | 23,812
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 2,859 | 2,774
Long-term | 19,715 | 18,414
Total | 22,574 | 21,188
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 110 | 226
Long-term | 824 | 821
Total | 934 | 1,047
Other investments |  |
Total Investments [Line Items] |  |
Current | 46 | 0
Long-term | 1,831 | 1,577
Total | $ 1,877 | $ 1,577

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