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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Jun. 30, 2021
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 44,925 | $ 11,389
Less than 12 Months - Unrealized Losses | (1,185) | (132)
12 Months or Greater - Fair Value | 2,889 | 127
12 Months or Greater - Unrealized Losses | (310) | (3)
Total Fair Value | 47,814 | 11,516
Total Unrealized Losses | (1,495) | (135)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 35,798 | 5,294
Less than 12 Months - Unrealized Losses | (918) | (111)
12 Months or Greater - Fair Value | 2,308 | 0
12 Months or Greater - Unrealized Losses | (262) | 0
Total Fair Value | 38,106 | 5,294
Total Unrealized Losses | (1,180) | (111)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 419 | 3,148
Less than 12 Months - Unrealized Losses | (6) | (1)
12 Months or Greater - Fair Value | 30 | 5
12 Months or Greater - Unrealized Losses | (4) | (1)
Total Fair Value | 449 | 3,153
Total Unrealized Losses | (10) | (2)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 450 | 1,211
Less than 12 Months - Unrealized Losses | (13) | (5)
12 Months or Greater - Fair Value | 33 | 87
12 Months or Greater - Unrealized Losses | (1) | (1)
Total Fair Value | 483 | 1,298
Total Unrealized Losses | (14) | (6)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 8,133 | 1,678
Less than 12 Months - Unrealized Losses | (241) | (8)
12 Months or Greater - Fair Value | 461 | 34
12 Months or Greater - Unrealized Losses | (36) | (1)
Total Fair Value | 8,594 | 1,712
Total Unrealized Losses | (277) | (9)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 125 | 58
Less than 12 Months - Unrealized Losses | (7) | (7)
12 Months or Greater - Fair Value | 57 | 1
12 Months or Greater - Unrealized Losses | (7) | 0
Total Fair Value | 182 | 59
Total Unrealized Losses | $ (14) | $ (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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