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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 71,035 | $ 69,641
Less than 12 Months - Unrealized Losses | (4,036) | (2,368)
12 Months or Greater - Fair Value | 6,679 | 3,138
12 Months or Greater - Unrealized Losses | (1,140) | (446)
Total Fair Value | 77,714 | 72,779
Total Unrealized Losses | (5,176) | (2,814)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 61,761 | 59,092
Less than 12 Months - Unrealized Losses | (3,411) | (1,835)
12 Months or Greater - Fair Value | 4,233 | 2,210
12 Months or Greater - Unrealized Losses | (830) | (352)
Total Fair Value | 65,994 | 61,302
Total Unrealized Losses | (4,241) | (2,187)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 392 | 418
Less than 12 Months - Unrealized Losses | (22) | (18)
12 Months or Greater - Fair Value | 64 | 27
12 Months or Greater - Unrealized Losses | (14) | (6)
Total Fair Value | 456 | 445
Total Unrealized Losses | (36) | (24)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 434 | 510
Less than 12 Months - Unrealized Losses | (27) | (26)
12 Months or Greater - Fair Value | 130 | 41
12 Months or Greater - Unrealized Losses | (18) | (4)
Total Fair Value | 564 | 551
Total Unrealized Losses | (45) | (30)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 8,258 | 9,443
Less than 12 Months - Unrealized Losses | (554) | (477)
12 Months or Greater - Fair Value | 2,178 | 786
12 Months or Greater - Unrealized Losses | (271) | (77)
Total Fair Value | 10,436 | 10,229
Total Unrealized Losses | (825) | (554)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 190 | 178
Less than 12 Months - Unrealized Losses | (22) | (12)
12 Months or Greater - Fair Value | 74 | 74
12 Months or Greater - Unrealized Losses | (7) | (7)
Total Fair Value | 264 | 252
Total Unrealized Losses | $ (29) | $ (19)

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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