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