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Income Taxes
 6 Months Ended
Mar. 31, 2023
Income Tax Disclosure [Abstract]  
Income Taxes
Note 11—Income Taxes
For the three and six months ended March 31, 2023, the effective income tax rates were 19% and 18%, respectively, and for the three and six months ended March 31, 2022, the effective income tax rates were 20% and 19%, respectively. The difference in the effective tax rates is primarily due to a $142 million tax benefit related to prior years recognized during the six months ended March 31, 2023 due to the reassessment of an uncertain tax position as a result of new information obtained during an ongoing tax examination.
During the three months ended March 31, 2023, the Company’s gross and net unrecognized tax benefits increased by $86 million and $26 million, respectively. During the six months ended March 31, 2023, the Company’s gross and net unrecognized tax benefits decreased by $22 million and $123 million, respectively. The change in unrecognized tax benefits is related to various tax positions across several jurisdictions. Additionally, for the six month period, the decrease in unrecognized tax benefits is primarily due to the reassessment mentioned above, partially offset by an increase in gross timing differences.
The Company’s tax filings are subject to examination by U.S. federal, state and foreign taxing authorities. The timing and outcome of the final resolutions of the various ongoing income tax examinations are highly uncertain. It is not reasonably possible to estimate the increase or decrease in unrecognized tax benefits within the next twelve months.