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Investment Components (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Jun. 30, 2023
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis $ 74,374  
Debt investments, Recorded Basis 71,189  
Derivative, net 293 $ 267
Cash and cash equivalents 17,305 34,704
Short-term Investments 63,712 76,558
Equity Investments 13,367 9,879
Cash, cash equivalents, and investments 94,384 121,141
Equity Securities    
Cash Cash Equivalents And Investments [Line Items]    
Equity investments, Recorded Basis 13,624 17,325
Cash and cash equivalents 257 7,446
Short-term Investments 0 0
Equity Investments 13,367 9,879
Equity Securities | Other    
Cash Cash Equivalents And Investments [Line Items]    
Equity investments, Recorded Basis 10,348 7,187
Cash and cash equivalents 0 0
Short-term Investments 0 0
Equity Investments 10,348 7,187
Equity Securities | Level 1    
Cash Cash Equivalents And Investments [Line Items]    
Equity investments, Recorded Basis 3,276 10,138
Cash and cash equivalents 257 7,446
Short-term Investments 0 0
Equity Investments 3,019 2,692
Cash    
Cash Cash Equivalents And Investments [Line Items]    
Cash 9,536 8,478
Cash and cash equivalents 9,536 8,478
Short-term Investments 0 0
Equity Investments 0 0
Derivatives, net    
Cash Cash Equivalents And Investments [Line Items]    
Derivative, net [1] 35 6
Cash and cash equivalents [1] 0 0
Short-term Investments [1] 35 6
Equity Investments [1] 0 0
Debt Securities    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 74,374 99,869
Debt investments, Unrealized Gains 84 13
Debt investments, Unrealized Losses (3,269) (4,550)
Debt investments, Recorded Basis 71,189 95,332
Cash and cash equivalents 7,512 18,780
Short-term Investments 63,677 76,552
Equity Investments 0 0
Debt Securities | Commercial Paper | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 4,577 16,589
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 4,577 16,589
Cash and cash equivalents 4,574 12,231
Short-term Investments 3 4,358
Equity Investments 0 0
Debt Securities | Certificates of deposit | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 2,973 2,701
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 2,973 2,701
Cash and cash equivalents 2,931 2,657
Short-term Investments 42 44
Equity Investments 0 0
Debt Securities | U.S. government securities | Level 1    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 54,775 65,237
Debt investments, Unrealized Gains 11 2
Debt investments, Unrealized Losses (2,848) (3,870)
Debt investments, Recorded Basis 51,938 61,369
Cash and cash equivalents 0 2,991
Short-term Investments 51,938 58,378
Equity Investments 0 0
Debt Securities | U.S. agency securities | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 24 2,703
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 24 2,703
Cash and cash equivalents 0 894
Short-term Investments 24 1,809
Equity Investments 0 0
Debt Securities | Foreign government bonds | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 420 498
Debt investments, Unrealized Gains 4 1
Debt investments, Unrealized Losses (12) (24)
Debt investments, Recorded Basis 412 475
Cash and cash equivalents 7 0
Short-term Investments 405 475
Equity Investments 0 0
Debt Securities | Mortgage- and asset-backed securities | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 926 824
Debt investments, Unrealized Gains 5 1
Debt investments, Unrealized Losses (31) (39)
Debt investments, Recorded Basis 900 786
Cash and cash equivalents 0 0
Short-term Investments 900 786
Equity Investments 0 0
Debt Securities | Corporate notes and bonds | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 10,164 10,809
Debt investments, Unrealized Gains 63 8
Debt investments, Unrealized Losses (349) (583)
Debt investments, Recorded Basis 9,878 10,234
Cash and cash equivalents 0 0
Short-term Investments 9,878 10,234
Equity Investments 0 0
Debt Securities | Corporate notes and bonds | Level 3    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 129 120
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 129 120
Cash and cash equivalents 0 0
Short-term Investments 129 120
Equity Investments 0 0
Debt Securities | Municipal securities | Level 2    
Cash Cash Equivalents And Investments [Line Items]    
Debt investments, Adjusted Cost Basis 282 285
Debt investments, Unrealized Gains 1 1
Debt investments, Unrealized Losses (13) (18)
Debt investments, Recorded Basis 270 268
Cash and cash equivalents 0 7
Short-term Investments 270 261
Equity 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 Investments $ 0 $ 0
[1] Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments.