Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Income Tax Examination [Line Items]
Effective income tax rate	8.20%	14.50%
Gross tax effected unrecognized tax benefits			$ 2,537
Amount of unrecognized tax benefits which may impact effective tax rate			1,973
Total net accrued interest, net of tax benefit			$ 284
Unrecognized tax benefits, income tax penalties and interest expense	$ 26	$ 17
Restructuring and impairment costs	345	49
Restructuring charges, tax benefit	$ 52	$ 7
IRELAND
Income Tax Examination [Line Items]
Ireland statutory income tax rate	12.50%	12.50%