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Additional Financial Information - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Nov. 13, 2020	Aug. 14, 2020
Supplemental Cash Flow Information [Line Items]
Interest payments		$ 128	$ 138	$ 148
Foreign income and withholding taxes		81	63	49
Common stock, dividends, per share, cash paid (in usd per share)	$ 0.12
Cash dividends declared		75
Dividends paid		344	94	925
Depreciation		71	61	55
Common Class A
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in usd per share)						$ 0.12
Common Class A | Subsequent Event
Supplemental Cash Flow Information [Line Items]
Dividends payable, amount per share (in usd per share)					$ 0.12
Spotify Technology S.A.
Supplemental Cash Flow Information [Line Items]
Sale of common shares, consideration received			504
Debt securities, available-for-sale, gain (loss)				$ 382
Estimated advance royalty recoveries			12
Estimated tax expense associated with net income on sale of shares			77
Common Stockholders
Supplemental Cash Flow Information [Line Items]
Dividends paid		281
Board of Directors Chairman
Supplemental Cash Flow Information [Line Items]
Cash dividends declared		$ 75	$ 206

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