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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Significant Components of Company's Income Tax Provision from Continuing Operations
The more significant components of the Company’s income tax provision from continuing operations are as follows (in millions):
 202320222021
Tax expense at Ireland statutory rate of 12.5%
$214 $214 $327 
U.S. state income tax, net of federal benefit39 (23)34 
Income subject to the U.S. federal tax rate
56 (95)
Income subject to rates different than the statutory rate92 125 30 
Reserve and valuation allowance adjustments(559)(274)66 
Intellectual property transactions and adjustments(176)— 417 
Restructuring and impairment costs11 40 (9)
Income tax provision (benefit)$(323)$(13)$868 
Effective tax rate(19)%
(1)%
33%
Summary of Changes in Valuation Allowance
The following table summarizes changes in the valuation allowance (in millions):
Year Ended September 30,
202320222021
Balance at beginning of period$5,973 $5,853 $5,518 
Allowance provision for new operating and other loss carryforwards573 325 505 
Allowance benefits(168)(205)(170)
Balance at end of period$6,378 $5,973 $5,853 
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
202320222021
Beginning balance, October 1$2,537 $2,726 $2,528 
Additions for tax positions related to the current year72 169 240 
Additions for tax positions of prior years96 31 33 
Reductions for tax positions of prior years(27)(48)(6)
Settlements with taxing authorities(6)(7)(24)
Statute closings and audit resolutions(446)(334)(45)
Ending balance, September 30$2,226 $2,537 $2,726 
Summary of Income Tax Contingencies
The following table summarizes tax effected unrecognized tax benefits that, if recognized, would impact the effective tax rate and the related accrued interest, net of tax benefit (in millions):
September 30,
202320222021
Tax effected unrecognized tax benefits that, if recognized, would affect the effective tax rate$1,581 $1,973 $2,268 
Net accrued interest335 284 252 
Tax Jurisdictions and Years Currently under Audit Exam
In the U.S., fiscal years 2017 through 2018 are currently under appeal by the Internal Revenue Service (“IRS”) for certain legal entities. Additionally, the Company is currently under exam in the following major non-U.S. jurisdictions for continuing operations:
 
Tax JurisdictionTax Years Covered
Belgium
2015 - 2022
Germany
2007 - 2021
Luxembourg
2017 - 2018
Mexico
2015 - 2018
United Kingdom
2014 - 2015; 2018; 2020 - 2021
Components of Provision for Income Taxes on Continuing Operations
Selected income tax data related to continuing operations were as follows (in millions):
 202320222021
Components of income (loss) from continuing operations before income taxes:
U.S. $(130)$67 $543 
Non-U.S.1,840 1,643 2,071 
Income from continuing operations before income taxes$1,710 $1,710 $2,614 
Components of the provision (benefit) for income taxes:
Current
U.S. federal$(165)$(219)$459 
U.S. state105 53 108 
Non-U.S.413 294 265 
353 128 832 
Deferred
U.S. federal(267)(175)(7)
U.S. state(25)(69)46 
Non-U.S.(384)103 (3)
(676)(141)36 
Income tax provision (benefit)$(323)$(13)$868 
Income taxes paid $430 $568 $504 
Deferred Taxes Classified in Consolidated Statements of Financial Position
Deferred taxes were classified in the consolidated statements of financial position as follows (in millions):
 September 30,
 20232022
Other noncurrent assets$1,499 $954 
Other noncurrent liabilities(411)(503)
Net deferred tax asset$1,088 $451 
Temporary Differences and Carryforwards in Deferred Tax Assets and Liabilities
Temporary differences and carryforwards which gave rise to deferred tax assets and liabilities included (in millions):
 
 September 30,
 20232022
Deferred tax assets
Accrued expenses and reserves$507 $376 
Employee and retiree benefits71 78 
Property, plant and equipment629 444 
Net operating loss and other credit carryforwards6,748 6,488 
Research and development171 52 
Operating lease liabilities348 309 
Other, net38 58 
8,512 7,805 
Valuation allowances(6,378)(5,973)
2,134 1,832 
Deferred tax liabilities
Subsidiaries, joint ventures and partnerships446 338 
Intangible assets252 734 
Operating lease right-of-use assets348 309 
1,046 1,381 
Net deferred tax asset$1,088 $451