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Investment Components (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Jun. 30, 2023
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis $ 73,113  
Debt investments, Recorded Basis 69,674  
Derivative, net 117 $ 267
Cash and cash equivalents 19,634 34,704
Short-term Investments 60,387 76,558
Equity and other investments 14,807 9,879
Cash, cash equivalents, and investments 94,828 121,141
Equity Securities    
Cash Cash Equivalents And Investments [Line Items]    
Equity investments, Recorded Basis 13,565 17,325
Cash and cash equivalents 258 7,446
Short-term Investments 0 0
Equity and other investments 13,307 9,879
Equity Securities | Other    
Cash Cash Equivalents And Investments [Line Items]    
Equity investments, Recorded Basis 10,225 7,187
Cash and cash equivalents 0 0
Short-term Investments 0 0
Equity and other investments 10,225 7,187
Equity Securities | Level 1    
Cash Cash Equivalents And Investments [Line Items]    
Equity investments, Recorded Basis 3,340 10,138
Cash and cash equivalents 258 7,446
Short-term Investments 0 0
Equity and other investments 3,082 2,692
Cash    
Cash Cash Equivalents And Investments [Line Items]    
Cash 11,581 8,478
Cash and cash equivalents 11,581 8,478
Short-term Investments 0 0
Equity and other investments 0 0
Derivatives, net    
Cash Cash Equivalents And Investments [Line Items]    
Derivative, net [1] 8 6
Cash and cash equivalents [1] 0 0
Short-term Investments [1] 8 6
Equity and other investments [1] 0 0
Debt Securities    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 73,113 99,869
Debt investments, Unrealized Gains 52 13
Debt investments, Unrealized Losses (3,491) (4,550)
Debt investments, Recorded Basis 69,674 95,332
Cash and cash equivalents 7,795 18,780
Short-term Investments 60,379 76,552
Equity and other investments 1,500 0
Debt Securities | Commercial Paper | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 5,535 16,589
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 5,535 16,589
Cash and cash equivalents 5,535 12,231
Short-term Investments 0 4,358
Equity and other investments 0 0
Debt Securities | Certificates of deposit | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 2,300 2,701
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 2,300 2,701
Cash and cash equivalents 2,256 2,657
Short-term Investments 44 44
Equity and other investments 0 0
Debt Securities | U.S. government securities | Level 1    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 52,036 65,237
Debt investments, Unrealized Gains 3 2
Debt investments, Unrealized Losses (3,074) (3,870)
Debt investments, Recorded Basis 48,965 61,369
Cash and cash equivalents 4 2,991
Short-term Investments 48,961 58,378
Equity and other investments 0 0
Debt Securities | U.S. agency securities | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 23 2,703
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 23 2,703
Cash and cash equivalents 0 894
Short-term Investments 23 1,809
Equity and other investments 0 0
Debt Securities | Foreign government bonds | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 352 498
Debt investments, Unrealized Gains 4 1
Debt investments, Unrealized Losses (12) (24)
Debt investments, Recorded Basis 344 475
Cash and cash equivalents 0 0
Short-term Investments 344 475
Equity and other investments 0 0
Debt Securities | Mortgage- and asset-backed securities | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 980 824
Debt investments, Unrealized Gains 4 1
Debt investments, Unrealized Losses (34) (39)
Debt investments, Recorded Basis 950 786
Cash and cash equivalents 0 0
Short-term Investments 950 786
Equity and other investments 0 0
Debt Securities | Corporate notes and bonds | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 9,874 10,809
Debt investments, Unrealized Gains 40 8
Debt investments, Unrealized Losses (340) (583)
Debt investments, Recorded Basis 9,574 10,234
Cash and cash equivalents 0 0
Short-term Investments 9,574 10,234
Equity and other investments 0 0
Debt Securities | Corporate notes and bonds | Level 3    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 1,646 120
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses (1) 0
Debt investments, Recorded Basis 1,645 120
Cash and cash equivalents 0 0
Short-term Investments 145 120
Equity and other investments 1,500 0
Debt Securities | Municipal securities | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 263 285
Debt investments, Unrealized Gains 1 1
Debt investments, Unrealized Losses (14) (18)
Debt investments, Recorded Basis 250 268
Cash and cash equivalents 0 7
Short-term Investments 250 261
Equity and other investments 0 0
Debt Securities | Municipal securities | Level 3    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 104 103
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses (16) (16)
Debt investments, Recorded Basis 88 87
Cash and cash equivalents 0 0
Short-term Investments 88 87
Equity and other investments $ 0 $ 0
[1] Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments.