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Investment Components (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Jun. 30, 2021
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis $ 115,397  
Debt investments, Recorded Basis 117,964  
Derivative, net 296 $ 258
Cash and cash equivalents 20,604 14,224
Short-term Investments 104,765 116,110
Equity Investments 6,994 5,984
Cash, cash equivalents, and investments 132,363 136,318
Equity investments    
Cash, Cash Equivalents and Investments [Line Items]    
Equity investments, Recorded Basis 8,123 6,960
Cash and cash equivalents 1,129 976
Short-term Investments 0 0
Equity Investments 6,994 5,984
Equity investments | Other    
Cash, Cash Equivalents and Investments [Line Items]    
Equity investments, Recorded Basis 6,141 5,378
Cash and cash equivalents 0 0
Short-term Investments 0 0
Equity Investments 6,141 5,378
Equity investments | Level 1    
Cash, Cash Equivalents and Investments [Line Items]    
Equity investments, Recorded Basis 1,982 1,582
Cash and cash equivalents 1,129 976
Short-term Investments 0 0
Equity Investments 853 606
Cash    
Cash, Cash Equivalents and Investments [Line Items]    
Cash 6,255 7,272
Cash and cash equivalents 6,255 7,272
Short-term Investments 0 0
Equity Investments 0 0
Derivatives, net    
Cash, Cash Equivalents and Investments [Line Items]    
Derivative, net [1] 21 78
Cash and cash equivalents [1] 0 0
Short-term Investments [1] 21 78
Equity Investments [1] 0 0
Debt investments    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 115,397 117,966
Debt investments, Unrealized Gains 2,768 4,177
Debt investments, Unrealized Losses (201) (135)
Debt investments, Recorded Basis 117,964 122,008
Cash and cash equivalents 13,220 5,976
Short-term Investments 104,744 116,032
Equity Investments 0 0
Debt investments | Commercial Paper | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 7,464 4,316
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 7,464 4,316
Cash and cash equivalents 7,233 1,331
Short-term Investments 231 2,985
Equity Investments 0 0
Debt investments | Certificates of deposit | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 4,179 3,615
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 4,179 3,615
Cash and cash equivalents 3,938 2,920
Short-term Investments 241 695
Equity Investments 0 0
Debt investments | U.S. government securities | Level 1    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 89,746 90,664
Debt investments, Unrealized Gains 2,552 3,832
Debt investments, Unrealized Losses (136) (111)
Debt investments, Recorded Basis 92,162 94,385
Cash and cash equivalents 850 1,500
Short-term Investments 91,312 92,885
Equity Investments 0 0
Debt investments | U.S. agency securities | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 2,007 807
Debt investments, Unrealized Gains 0 2
Debt investments, Unrealized Losses (1) 0
Debt investments, Recorded Basis 2,006 809
Cash and cash equivalents 1,199 0
Short-term Investments 807 809
Equity Investments 0 0
Debt investments | Foreign government bonds | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 198 6,213
Debt investments, Unrealized Gains 4 9
Debt investments, Unrealized Losses (4) (2)
Debt investments, Recorded Basis 198 6,220
Cash and cash equivalents 0 225
Short-term Investments 198 5,995
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 3,089 3,442
Debt investments, Unrealized Gains 11 22
Debt investments, Unrealized Losses (15) (6)
Debt investments, Recorded Basis 3,085 3,458
Cash and cash equivalents 0 0
Short-term Investments 3,085 3,458
Equity Investments 0 0
Debt investments | Corporate notes and bonds | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 8,261 8,443
Debt investments, Unrealized Gains 144 249
Debt investments, Unrealized Losses (38) (9)
Debt investments, Recorded Basis 8,367 8,683
Cash and cash equivalents 0 0
Short-term Investments 8,367 8,683
Equity Investments 0 0
Debt investments | Corporate notes and bonds | Level 3    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 46 63
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 46 63
Cash and cash equivalents 0 0
Short-term Investments 46 63
Equity Investments 0 0
Debt investments | Municipal securities | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 304 308
Debt investments, Unrealized Gains 57 63
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 361 371
Cash and cash equivalents 0 0
Short-term Investments 361 371
Equity Investments 0 0
Debt investments | Municipal securities | Level 3    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Adjusted Cost Basis 103 95
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses (7) (7)
Debt investments, Recorded Basis 96 88
Cash and cash equivalents 0 0
Short-term Investments 96 88
Equity Investments $ 0 $ 0
[1] Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments.