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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Total Investments [Line Items] |  |
Current | $ 3,006 | $ 3,000
Long-term | 22,136 | 20,812
Total | 25,142 | 23,812
Debt securities available for sale |  |
Total Investments [Line Items] |  |
Current | 2,878 | 2,774
Long-term | 19,468 | 18,414
Total | 22,346 | 21,188
Mortgage loans |  |
Total Investments [Line Items] |  |
Current | 128 | 226
Long-term | 848 | 821
Total | 976 | 1,047
Other investments |  |
Total Investments [Line Items] |  |
Current | 0 | 0
Long-term | 1,820 | 1,577
Total | $ 1,820 | $ 1,577

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