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Investments - Additional Information (Detail) $ in Millions	Dec. 31, 2025 USD ($)
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity investments, after one year through five years	$ 13
Foreign government debt, after five years through ten years	316
Held-to-maturity investments, after ten years	$ 178

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth 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

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-Section 50
-Paragraph 3
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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth 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

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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 942
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- References

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