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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Jun. 30, 2021
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 7,936 | $ 11,389
Less than 12 Months - Unrealized Losses | (85) | (132)
12 Months or Greater - Fair Value | 2,714 | 127
12 Months or Greater - Unrealized Losses | (116) | (3)
Total Fair Value | 10,650 | 11,516
Total Unrealized Losses | (201) | (135)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 3,382 | 5,294
Less than 12 Months - Unrealized Losses | (40) | (111)
12 Months or Greater - Fair Value | 2,206 | 0
12 Months or Greater - Unrealized Losses | (97) | 0
Total Fair Value | 5,588 | 5,294
Total Unrealized Losses | (137) | (111)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 82 | 3,148
Less than 12 Months - Unrealized Losses | (2) | (1)
12 Months or Greater - Fair Value | 13 | 5
12 Months or Greater - Unrealized Losses | (2) | (1)
Total Fair Value | 95 | 3,153
Total Unrealized Losses | (4) | (2)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,679 | 1,211
Less than 12 Months - Unrealized Losses | (12) | (5)
12 Months or Greater - Fair Value | 191 | 87
12 Months or Greater - Unrealized Losses | (3) | (1)
Total Fair Value | 1,870 | 1,298
Total Unrealized Losses | (15) | (6)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 2,773 | 1,678
Less than 12 Months - Unrealized Losses | (31) | (8)
12 Months or Greater - Fair Value | 250 | 34
12 Months or Greater - Unrealized Losses | (7) | (1)
Total Fair Value | 3,023 | 1,712
Total Unrealized Losses | (38) | (9)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 20 | 58
Less than 12 Months - Unrealized Losses | 0 | (7)
12 Months or Greater - Fair Value | 54 | 1
12 Months or Greater - Unrealized Losses | (7) | 0
Total Fair Value | 74 | 59
Total Unrealized Losses | $ (7) | $ (7)

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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=124269663&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=123581744&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=123581744&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=124269663&loc=SL82922890-210455 + Details
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