Income Taxes	3 Months Ended
Income Taxes	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Note 12—Income Taxes For the three months ended December 31, 2020 and 2019, the effective income tax rates were 17% and 18%, respectively. The difference in the effective tax rates between the three-month periods was primarily due to an $81 million tax benefit recognized during the three months ended December 31, 2020 as a result of the conclusion of audits by taxing authorities. During the three months ended December 31, 2020, the Company’s gross and net unrecognized tax benefits decreased by $6 million and $49 million, respectively. The decrease in unrecognized tax benefits is primarily due to the recognition of previously unrecognized tax benefits as a result of the conclusion of audits by taxing authorities, partially offset by increases in gross timing differences as well as various tax positions across several jurisdictions. During the three months ended December 31, 2020 and 2019, there were no significant changes in accrued interest and penalties related to uncertain tax positions. 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.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.