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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 6,876 | $ 2,678
Less than 12 Months - Unrealized Losses | (27) | (5)
12 Months or Greater - Fair Value | 26,281 | 39,989
12 Months or Greater - Unrealized Losses | (52) | (117)
Total Fair Value | 33,157 | 42,667
Total Unrealized Losses | (79) | (122)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 4,169 | 1,491
Less than 12 Months - Unrealized Losses | (18) | (1)
12 Months or Greater - Fair Value | 25,788 | 39,158
12 Months or Greater - Unrealized Losses | (39) | (103)
Total Fair Value | 29,957 | 40,649
Total Unrealized Losses | (57) | (104)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,464 | 25
Less than 12 Months - Unrealized Losses | (3) | 0
12 Months or Greater - Fair Value | 63 | 77
12 Months or Greater - Unrealized Losses | (8) | (8)
Total Fair Value | 1,527 | 102
Total Unrealized Losses | (11) | (8)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 563 | 664
Less than 12 Months - Unrealized Losses | (1) | (1)
12 Months or Greater - Fair Value | 198 | 378
12 Months or Greater - Unrealized Losses | (1) | (2)
Total Fair Value | 761 | 1,042
Total Unrealized Losses | (2) | (3)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 680 | 498
Less than 12 Months - Unrealized Losses | (5) | (3)
12 Months or Greater - Fair Value | 231 | 376
12 Months or Greater - Unrealized Losses | (4) | (4)
Total Fair Value | 911 | 874
Total Unrealized Losses | (9) | $ (7)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 0 |
Less than 12 Months - Unrealized Losses | 0 |
12 Months or Greater - Fair Value | 1 |
12 Months or Greater - Unrealized Losses | 0 |
Total Fair Value | 1 |
Total Unrealized Losses | $ 0 |

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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=118955579&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=118939692&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=118942371&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=118939692&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=118955579&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=118939692&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=118955579&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=118942371&loc=SL82922954-210456 + Details
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