Investments - Total Investments Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Total Investments [Line Items]
Current	$ 2,407	$ 3,259
Long-term	28,934	23,019
Total	31,341	26,278
Debt securities available for sale
Total Investments [Line Items]
Current	2,256	3,131
Long-term	23,777	18,582
Total	26,033	21,713
Mortgage loans
Total Investments [Line Items]
Current	151	128
Long-term	1,354	1,183
Total	1,505	1,311
Other investments
Total Investments [Line Items]
Current	0	0
Long-term	3,803	3,254
Total	$ 3,803	$ 3,254

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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