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Investment Components (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis $ 122,900  
Debt investments, Recorded Basis 129,798  
Derivative, net 246 $ 137
Cash and cash equivalents 13,576 11,356
Short-term Investments 122,951 122,463
Equity Investments 2,965 2,649
Cash, cash equivalents, and investments 139,492 136,468
Equity investments    
Cash, Cash Equivalents and Investments [Line Items]    
Equity investments, Recorded Basis 3,749 3,058
Cash and cash equivalents 784 409
Short-term Investments 0 0
Equity Investments 2,965 2,649
Equity investments | Other    
Cash, Cash Equivalents and Investments [Line Items]    
Equity investments, Recorded Basis 2,551 2,085
Cash and cash equivalents 0 0
Short-term Investments 0 0
Equity Investments 2,551 2,085
Equity investments | Level 1    
Cash, Cash Equivalents and Investments [Line Items]    
Equity investments, Recorded Basis 1,198 973
Cash and cash equivalents 784 409
Short-term Investments 0 0
Equity Investments 414 564
Cash    
Cash, Cash Equivalents and Investments [Line Items]    
Cash 5,910 3,771
Cash and cash equivalents 5,910 3,771
Short-term Investments 0 0
Equity Investments 0 0
Derivatives, net    
Cash, Cash Equivalents and Investments [Line Items]    
Derivative, net [1] 35 (13)
Cash and cash equivalents [1] 0 0
Short-term Investments [1] 35 (13)
Equity Investments [1] 0 0
Debt investments    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 122,900 127,747
Debt investments, Unrealized Gains 6,929 2,027
Debt investments, Unrealized Losses (31) (122)
Debt investments, Recorded Basis 129,798 129,652
Cash and cash equivalents 6,882 7,176
Short-term Investments 122,916 122,476
Equity Investments 0 0
Debt investments | Commercial Paper | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 4,687 2,211
Debt investments, Unrealized Gains 1 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 4,688 2,211
Cash and cash equivalents 1,618 1,773
Short-term Investments 3,070 438
Equity Investments 0 0
Debt investments | Certificates of deposit | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 2,898 2,018
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 2,898 2,018
Cash and cash equivalents 1,646 1,430
Short-term Investments 1,252 588
Equity Investments 0 0
Debt investments | U.S. government securities | Level 1    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 92,067 104,925
Debt investments, Unrealized Gains 6,495 1,854
Debt investments, Unrealized Losses (1) (104)
Debt investments, Recorded Basis 98,561 106,675
Cash and cash equivalents 3,168 769
Short-term Investments 95,393 105,906
Equity Investments 0 0
Debt investments | U.S. agency securities | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 2,439 988
Debt investments, Unrealized Gains 2 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 2,441 988
Cash and cash equivalents 449 698
Short-term Investments 1,992 290
Equity Investments 0 0
Debt investments | Foreign government bonds | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 6,982 6,350
Debt investments, Unrealized Gains 6 4
Debt investments, Unrealized Losses (3) (8)
Debt investments, Recorded Basis 6,985 6,346
Cash and cash equivalents 1 2,506
Short-term Investments 6,984 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 4,865 3,554
Debt investments, Unrealized Gains 41 10
Debt investments, Unrealized Losses (6) (3)
Debt investments, Recorded Basis 4,900 3,561
Cash and cash equivalents 0 0
Short-term Investments 4,900 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 8,500 7,437
Debt investments, Unrealized Gains 327 111
Debt investments, Unrealized Losses (17) (7)
Debt investments, Recorded Basis 8,810 7,541
Cash and cash equivalents 0 0
Short-term Investments 8,810 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 58 15
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 58 15
Cash and cash equivalents 0 0
Short-term Investments 58 15
Equity Investments 0 0
Debt investments | Municipal securities | Level 2    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 313 242
Debt investments, Unrealized Gains 57 48
Debt investments, Unrealized Losses (4) 0
Debt investments, Recorded Basis 366 290
Cash and cash equivalents 0 0
Short-term Investments 366 290
Equity Investments 0 0
Debt investments | Municipal securities | Level 3    
Cash, Cash Equivalents and Investments [Line Items]    
Debt investments, Cost Basis 91 7
Debt investments, Unrealized Gains 0 0
Debt investments, Unrealized Losses 0 0
Debt investments, Recorded Basis 91 7
Cash and cash equivalents 0 0
Short-term Investments 91 7
Equity Investments $ 0 $ 0
[1] Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments.