Investment Components (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | $ 129,308 | |
Debt investments, Recorded Basis | | 131,911 | |
Derivative, net | | 60 | $ 137 |
Cash and cash equivalents | | 13,117 | 11,356 |
Short-term Investments | | 123,519 | 122,463 |
Equity Investments | | 2,684 | 2,649 |
Cash, cash equivalents, and investments | | 139,320 | 136,468 |
Equity investments | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Equity investments, Recorded Basis | | 3,182 | 3,058 |
Cash and cash equivalents | | 498 | 409 |
Short-term Investments | | 0 | 0 |
Equity Investments | | 2,684 | 2,649 |
Equity investments | Other | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Equity investments, Recorded Basis | | 2,187 | 2,085 |
Cash and cash equivalents | | 0 | 0 |
Short-term Investments | | 0 | 0 |
Equity Investments | | 2,187 | 2,085 |
Equity investments | Level 1 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Equity investments, Recorded Basis | | 995 | 973 |
Cash and cash equivalents | | 498 | 409 |
Short-term Investments | | 0 | 0 |
Equity Investments | | 497 | 564 |
Cash | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Cash | | 4,200 | 3,771 |
Cash and cash equivalents | | 4,200 | 3,771 |
Short-term Investments | | 0 | 0 |
Equity Investments | | 0 | 0 |
Derivatives, net | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Derivative, net | [1] | 27 | (13) |
Cash and cash equivalents | [1] | 0 | 0 |
Short-term Investments | [1] | 27 | (13) |
Equity Investments | [1] | 0 | 0 |
Debt investments | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 129,308 | 127,747 |
Debt investments, Unrealized Gains | | 2,682 | 2,027 |
Debt investments, Unrealized Losses | | (79) | (122) |
Debt investments, Recorded Basis | | 131,911 | 129,652 |
Cash and cash equivalents | | 8,419 | 7,176 |
Short-term Investments | | 123,492 | 122,476 |
Equity Investments | | 0 | 0 |
Debt investments | Commercial Paper | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 4,613 | 2,211 |
Debt investments, Unrealized Gains | | 0 | 0 |
Debt investments, Unrealized Losses | | 0 | 0 |
Debt investments, Recorded Basis | | 4,613 | 2,211 |
Cash and cash equivalents | | 4,339 | 1,773 |
Short-term Investments | | 274 | 438 |
Equity Investments | | 0 | 0 |
Debt investments | Certificates of deposit | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 1,920 | 2,018 |
Debt investments, Unrealized Gains | | 0 | 0 |
Debt investments, Unrealized Losses | | 0 | 0 |
Debt investments, Recorded Basis | | 1,920 | 2,018 |
Cash and cash equivalents | | 1,134 | 1,430 |
Short-term Investments | | 786 | 588 |
Equity Investments | | 0 | 0 |
Debt investments | U.S. government securities | Level 1 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 104,575 | 104,925 |
Debt investments, Unrealized Gains | | 2,483 | 1,854 |
Debt investments, Unrealized Losses | | (57) | (104) |
Debt investments, Recorded Basis | | 107,001 | 106,675 |
Cash and cash equivalents | | 617 | 769 |
Short-term Investments | | 106,384 | 105,906 |
Equity Investments | | 0 | 0 |
Debt investments | U.S. agency securities | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 749 | 988 |
Debt investments, Unrealized Gains | | 0 | 0 |
Debt investments, Unrealized Losses | | 0 | 0 |
Debt investments, Recorded Basis | | 749 | 988 |
Cash and cash equivalents | | 200 | 698 |
Short-term Investments | | 549 | 290 |
Equity Investments | | 0 | 0 |
Debt investments | Foreign government bonds | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 6,196 | 6,350 |
Debt investments, Unrealized Gains | | 4 | 4 |
Debt investments, Unrealized Losses | | (11) | (8) |
Debt investments, Recorded Basis | | 6,189 | 6,346 |
Cash and cash equivalents | | 2,129 | 2,506 |
Short-term Investments | | 4,060 | 3,840 |
Equity Investments | | 0 | 0 |
Debt investments | Mortgage- and asset-backed securities | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 3,438 | 3,554 |
Debt investments, Unrealized Gains | | 12 | 10 |
Debt investments, Unrealized Losses | | (2) | (3) |
Debt investments, Recorded Basis | | 3,448 | 3,561 |
Cash and cash equivalents | | 0 | 0 |
Short-term Investments | | 3,448 | 3,561 |
Equity Investments | | 0 | 0 |
Debt investments | Corporate notes and bonds | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 7,550 | 7,437 |
Debt investments, Unrealized Gains | | 128 | 111 |
Debt investments, Unrealized Losses | | (9) | (7) |
Debt investments, Recorded Basis | | 7,669 | 7,541 |
Cash and cash equivalents | | 0 | 0 |
Short-term Investments | | 7,669 | 7,541 |
Equity Investments | | 0 | 0 |
Debt investments | Corporate notes and bonds | Level 3 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 13 | 15 |
Debt investments, Unrealized Gains | | 0 | 0 |
Debt investments, Unrealized Losses | | 0 | 0 |
Debt investments, Recorded Basis | | 13 | 15 |
Cash and cash equivalents | | 0 | 0 |
Short-term Investments | | 13 | 15 |
Equity Investments | | 0 | 0 |
Debt investments | Municipal securities | Level 2 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 242 | 242 |
Debt investments, Unrealized Gains | | 55 | 48 |
Debt investments, Unrealized Losses | | 0 | 0 |
Debt investments, Recorded Basis | | 297 | 290 |
Cash and cash equivalents | | 0 | 0 |
Short-term Investments | | 297 | 290 |
Equity Investments | | 0 | 0 |
Debt investments | Municipal securities | Level 3 | | | |
Cash, Cash Equivalents and Investments [Line Items] | | | |
Debt investments, Cost Basis | | 12 | 7 |
Debt investments, Unrealized Gains | | 0 | 0 |
Debt investments, Unrealized Losses | | 0 | 0 |
Debt investments, Recorded Basis | | 12 | 7 |
Cash and cash equivalents | | 0 | 0 |
Short-term Investments | | 12 | 7 |
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. | |