Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended			15 Months Ended
	Dec. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax benefit from restructuring foreign subsidiary		$ 11	$ 13	$ 103
Payroll Taxes Paid	$ 37
PayrollTaxDeferralFromCARESActThroughDec2020					$ 73
Non-U.S. tax holiday tax rate reductions for certain foreign jurisdictions, expiration period in years		8 years
Unrecognized tax benefits that would impact effective tax rate		$ 151
Unrecognized tax benefits, income tax penalties and interest expense		(6)	(4)	1
Unrecognized tax benefits, income tax penalties and interest accrued		24	24
Income taxes paid		$ 720	$ 680	$ 400
Amount of net operating losses and tax credits expiring over the next 10 years		Approximately two-thirds
Net operating losses and tax credits, remaining to expire over next 10 years		$ 212