Investments - Schedule of Contractual Maturities of Available-for-Sale Debt Securities (Details) $ in Millions	Mar. 31, 2025 USD ($)
Amortized Cost
Due within one year	$ 1,806
Due after one year through five years	1,296
Due after five years	99
Debt securities, amortized cost	3,201
Estimated Fair Value
Due within one year	1,807
Due after one year through five years	1,291
Due after five years	96
Total, Estimated Fair Value	$ 3,194

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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- Definition

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

+ References

No definition available.

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- Definition

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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- Definition

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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- Definition

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).

+ References

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