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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Total Investments [Line Items]
Current	$ 2,134	$ 2,407
Long-term	31,553	28,934
Total	33,687	31,341
Debt securities available for sale
Total Investments [Line Items]
Current	1,978	2,256
Long-term	25,857	23,777
Total	27,835	26,033
Mortgage loans
Total Investments [Line Items]
Current	156	151
Long-term	1,367	1,354
Total	1,523	1,505
Other investments
Total Investments [Line Items]
Current	0	0
Long-term	4,329	3,803
Total	$ 4,329	$ 3,803

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