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Fair Value Measurements and Investments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Level 1
Assets
Total	$ 13,058	$ 17,658
Liabilities
Deferred compensation liability	179	167
Derivative instruments	0	0
Total	179	167
Level 1 | Money market funds
Assets
Cash equivalents and restricted cash equivalents:	9,448	11,779
Other current and non-current assets:	4	4
Level 1 | Marketable equity securities
Assets
Investment securities	363	490
Level 1 | U.S. government-sponsored debt securities
Assets
Cash equivalents and restricted cash equivalents:	0	0
Investment securities	0	0
Level 1 | U.S. Treasury securities
Assets
Cash equivalents and restricted cash equivalents:	200	2,400
Investment securities	3,043	2,985
Level 1 | Derivative instruments
Assets
Other current and non-current assets:	0	0
Level 2
Assets
Total	993	755
Liabilities
Deferred compensation liability	0	0
Derivative instruments	226	109
Total	226	109
Level 2 | Money market funds
Assets
Cash equivalents and restricted cash equivalents:	0	0
Other current and non-current assets:	0	0
Level 2 | Marketable equity securities
Assets
Investment securities	0	0
Level 2 | U.S. government-sponsored debt securities
Assets
Cash equivalents and restricted cash equivalents:	418	100
Investment securities	110	245
Level 2 | U.S. Treasury securities
Assets
Cash equivalents and restricted cash equivalents:	0	0
Investment securities	0	0
Level 2 | Derivative instruments
Assets
Other current and non-current assets:	$ 465	$ 410

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