Investments - Schedule of Contractual Maturities of Available-for-Sale Debt Securities (Details) $ in Millions	Mar. 31, 2026 USD ($)
Amortized Cost
Due within one year	$ 1,582
Due after one year through five years	2,168
Due after five years	101
Debt securities, amortized cost	3,851
Estimated Fair Value
Due within one year	1,583
Due after one year through five years	2,158
Due after five years	99
Total, Estimated Fair Value	$ 3,840

Debt Securities, Available-For-Sale, Amortized Cost, Maturity, Allocated And Single Maturity Date, After Year Five

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- Definition

Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, After Year One Through Year Five

+ References

No definition available.

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Debt Securities, Available-For-Sale, Fair Value, Maturity, Allocated And Single Maturity Date, After Year Five

+ References

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Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, After Year One Through Year Five

+ References

No definition available.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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