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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 4,196 | $ 4,552
Less than 12 Months - Unrealized Losses | (22) | (31)
12 Months or Greater - Fair Value | 0 | 0
12 Months or Greater - Unrealized Losses | 0 | 0
Total Fair Value | 4,196 | 4,552
Total Unrealized Losses | (22) | (31)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,847 | 2,323
Less than 12 Months - Unrealized Losses | 0 | (1)
12 Months or Greater - Fair Value | 0 | 0
12 Months or Greater - Unrealized Losses | 0 | 0
Total Fair Value | 1,847 | 2,323
Total Unrealized Losses | 0 | (1)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 977 | 500
Less than 12 Months - Unrealized Losses | (3) | (3)
12 Months or Greater - Fair Value | 0 | 0
12 Months or Greater - Unrealized Losses | 0 | 0
Total Fair Value | 977 | 500
Total Unrealized Losses | (3) | (3)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 832 | 1,014
Less than 12 Months - Unrealized Losses | (4) | (6)
12 Months or Greater - Fair Value | 0 | 0
12 Months or Greater - Unrealized Losses | 0 | 0
Total Fair Value | 832 | 1,014
Total Unrealized Losses | (4) | (6)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 421 | 649
Less than 12 Months - Unrealized Losses | (5) | (17)
12 Months or Greater - Fair Value | 0 | 0
12 Months or Greater - Unrealized Losses | 0 | 0
Total Fair Value | 421 | 649
Total Unrealized Losses | (5) | (17)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 119 | 66
Less than 12 Months - Unrealized Losses | (10) | (4)
12 Months or Greater - Fair Value | 0 | 0
12 Months or Greater - Unrealized Losses | 0 | 0
Total Fair Value | 119 | 66
Total Unrealized Losses | $ (10) | $ (4)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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