Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		15 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2020
Income Tax [Line Items]
Income taxes	$ 134	$ 80	$ 232	$ 276
Effective income tax rate	21.00%	16.00%	22.00%	19.00%
Payroll tax deferral from CARES Act through December 2020					$ 73
Payroll Taxes Paid			$ 37	$ 37
Favorable net discrete items, percentage impact	6.00%		3.00%