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Debt Investment Maturities (Detail) $ in Millions	Dec. 31, 2020 USD ($)
Adjusted Cost Basis
Due in one year or less	$ 29,516
Due after one year through five years	58,954
Due after five years through 10 years	28,343
Due after 10 years	2,689
Debt investments, Adjusted Cost Basis	119,502
Estimated Fair Value
Due in one year or less	29,559
Due after one year through five years	62,275
Due after five years through 10 years	30,824
Due after 10 years	2,869
Total	$ 125,527

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- Definition

Amortized cost 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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 210
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