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Investments - Total Investment Schedule (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Total Investments [Line Items]    
Current $ 2,386 $ 2,407
Long-term 29,858 28,934
Total 32,244 31,341
Debt securities available for sale    
Total Investments [Line Items]    
Current 2,251 2,256
Long-term 24,303 23,777
Total 26,554 26,033
Mortgage loans    
Total Investments [Line Items]    
Current 135 151
Long-term 1,376 1,354
Total 1,511 1,505
Other investments    
Total Investments [Line Items]    
Current 0 0
Long-term 4,179 3,803
Total $ 4,179 $ 3,803