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Investments - Total Investment Schedule (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Total Investments [Line Items]
Current	$ 3,288	$ 3,259
Long-term	24,074	23,019
Total	27,362	26,278
Debt securities available for sale
Total Investments [Line Items]
Current	3,121	3,131
Long-term	19,505	18,582
Total	22,626	21,713
Mortgage loans
Total Investments [Line Items]
Current	167	128
Long-term	1,195	1,183
Total	1,362	1,311
Other investments
Total Investments [Line Items]
Current	0	0
Long-term	3,374	3,254
Total	$ 3,374	$ 3,254

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Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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