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Investment Components (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | ---
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | $ 124,848 |
Debt investments, Recorded Basis |  | 131,500 |
Derivative, net |  | 202 | $ 246
Cash and cash equivalents |  | 17,205 | 13,576
Short-term Investments |  | 120,772 | 122,951
Equity Investments |  | 3,103 | 2,965
Cash, cash equivalents, and investments |  | 141,080 | 139,492
Equity investments |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Equity investments, Recorded Basis |  | 3,827 | 3,749
Cash and cash equivalents |  | 724 | 784
Short-term Investments |  | 0 | 0
Equity Investments |  | 3,103 | 2,965
Equity investments | Other |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Equity investments, Recorded Basis |  | 2,657 | 2,551
Cash and cash equivalents |  | 0 | 0
Short-term Investments |  | 0 | 0
Equity Investments |  | 2,657 | 2,551
Equity investments | Level 1 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Equity investments, Recorded Basis |  | 1,170 | 1,198
Cash and cash equivalents |  | 724 | 784
Short-term Investments |  | 0 | 0
Equity Investments |  | 446 | 414
Cash |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Cash |  | 5,725 | 5,910
Cash and cash equivalents |  | 5,725 | 5,910
Short-term Investments |  | 0 | 0
Equity Investments |  | 0 | 0
Derivatives, net |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Derivative, net | [1] | 28 | 35
Cash and cash equivalents | [1] | 0 | 0
Short-term Investments | [1] | 28 | 35
Equity Investments | [1] | 0 | 0
Debt investments |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 124,848 | 122,900
Debt investments, Unrealized Gains |  | 6,674 | 6,929
Debt investments, Unrealized Losses |  | (22) | (31)
Debt investments, Recorded Basis |  | 131,500 | 129,798
Cash and cash equivalents |  | 10,756 | 6,882
Short-term Investments |  | 120,744 | 122,916
Equity Investments |  | 0 | 0
Debt investments | Commercial Paper | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 5,128 | 4,687
Debt investments, Unrealized Gains |  | 0 | 1
Debt investments, Unrealized Losses |  | 0 | 0
Debt investments, Recorded Basis |  | 5,128 | 4,688
Cash and cash equivalents |  | 2,869 | 1,618
Short-term Investments |  | 2,259 | 3,070
Equity Investments |  | 0 | 0
Debt investments | Certificates of deposit | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 2,674 | 2,898
Debt investments, Unrealized Gains |  | 0 | 0
Debt investments, Unrealized Losses |  | 0 | 0
Debt investments, Recorded Basis |  | 2,674 | 2,898
Cash and cash equivalents |  | 1,781 | 1,646
Short-term Investments |  | 893 | 1,252
Equity Investments |  | 0 | 0
Debt investments | U.S. government securities | Level 1 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 93,143 | 92,067
Debt investments, Unrealized Gains |  | 6,230 | 6,495
Debt investments, Unrealized Losses |  | 0 | (1)
Debt investments, Recorded Basis |  | 99,373 | 98,561
Cash and cash equivalents |  | 4,556 | 3,168
Short-term Investments |  | 94,817 | 95,393
Equity Investments |  | 0 | 0
Debt investments | U.S. agency securities | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 3,339 | 2,439
Debt investments, Unrealized Gains |  | 3 | 2
Debt investments, Unrealized Losses |  | 0 | 0
Debt investments, Recorded Basis |  | 3,342 | 2,441
Cash and cash equivalents |  | 1,550 | 449
Short-term Investments |  | 1,792 | 1,992
Equity Investments |  | 0 | 0
Debt investments | Foreign government bonds | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 7,054 | 6,982
Debt investments, Unrealized Gains |  | 7 | 6
Debt investments, Unrealized Losses |  | (3) | (3)
Debt investments, Recorded Basis |  | 7,058 | 6,985
Cash and cash equivalents |  | 0 | 1
Short-term Investments |  | 7,058 | 6,984
Equity Investments |  | 0 | 0
Debt investments | Mortgage- and asset-backed securities | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 4,764 | 4,865
Debt investments, Unrealized Gains |  | 42 | 41
Debt investments, Unrealized Losses |  | (4) | (6)
Debt investments, Recorded Basis |  | 4,802 | 4,900
Cash and cash equivalents |  | 0 | 0
Short-term Investments |  | 4,802 | 4,900
Equity Investments |  | 0 | 0
Debt investments | Corporate notes and bonds | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 8,287 | 8,500
Debt investments, Unrealized Gains |  | 332 | 327
Debt investments, Unrealized Losses |  | (5) | (17)
Debt investments, Recorded Basis |  | 8,614 | 8,810
Cash and cash equivalents |  | 0 | 0
Short-term Investments |  | 8,614 | 8,810
Equity Investments |  | 0 | 0
Debt investments | Corporate notes and bonds | Level 3 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 52 | 58
Debt investments, Unrealized Gains |  | 0 | 0
Debt investments, Unrealized Losses |  | 0 | 0
Debt investments, Recorded Basis |  | 52 | 58
Cash and cash equivalents |  | 0 | 0
Short-term Investments |  | 52 | 58
Equity Investments |  | 0 | 0
Debt investments | Municipal securities | Level 2 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 312 | 313
Debt investments, Unrealized Gains |  | 60 | 57
Debt investments, Unrealized Losses |  | (3) | (4)
Debt investments, Recorded Basis |  | 369 | 366
Cash and cash equivalents |  | 0 | 0
Short-term Investments |  | 369 | 366
Equity Investments |  | 0 | 0
Debt investments | Municipal securities | Level 3 |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |
Debt investments, Adjusted Cost Basis |  | 95 | 91
Debt investments, Unrealized Gains |  | 0 | 0
Debt investments, Unrealized Losses |  | (7) | 0
Debt investments, Recorded Basis |  | 88 | 91
Cash and cash equivalents |  | 0 | 0
Short-term Investments |  | 88 | 91
Equity Investments |  | $ 0 | $ 0
[1] | Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments.

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