Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 13,334	$ 15,689
Cash, cash equivalents, restricted cash and restricted cash equivalents	18,383	20,377	$ 18,323	$ 19,799
U.S. litigation escrow
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and restricted cash equivalents:	1,705	1,449
Customer collateral
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and restricted cash equivalents:	2,591	2,342
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and restricted cash equivalents:	$ 753	$ 897