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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Restrictions on Cash and Cash Equivalents The following table provides a reconciliation of the total cash, cash equivalents and restricted
cash reported on the Condensed Consolidated Balance Sheets to the corresponding amounts reported on the Condensed Consolidated Statements of Cash Flows.
March 31,
2022		March 31,
2021
Cash and cash equivalents$718 $444 
Restricted cash55 28 
Cash, cash equivalents and restricted cash$773 $472 
Schedule of Cash and Cash Equivalents The following table provides a reconciliation of the total cash, cash equivalents and restricted
cash reported on the Condensed Consolidated Balance Sheets to the corresponding amounts reported on the Condensed Consolidated Statements of Cash Flows.
March 31,
2022		March 31,
2021
Cash and cash equivalents$718 $444 
Restricted cash55 28 
Cash, cash equivalents and restricted cash$773 $472 
Shares Used in Computing Basic and Diluted Earnings Per Share Shares used in computing basic and diluted earnings per share are as follows: 
Three Months Ended
March 31,		Six Months Ended
March 31,
 2022202120222021
Denominator (thousands of shares):
Weighted-average common shares outstanding — basic210,163 208,930 209,919 208,849 
Incremental shares issuable for stock options, common stock awards and Equity Units (a)5,765 1,162 6,017 1,014 
Weighted-average common shares outstanding — diluted215,928 210,092 215,936 209,863 
(a)For the three and six months ended March 31, 2022 and 2021, there were 6,535 and 5,102 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive.