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 |
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[1] | Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments. | |