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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Income Taxes, Additional Information [Line Items] |  |  |
Discrete non-cash tax charge | $ 101 |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | $ 305 |  |
Effective income tax rate | 50.00% | (7.00%) |
U.S. federal statutory income tax rate | 21.00% | 35.00% |
Gross tax effected unrecognized tax benefits |  |  | $ 2,173
Amount of unrecognized tax benefits which may impact effective tax rate |  |  | 2,047
Total net accrued interest, net of tax benefit |  |  | $ 99
Estimated benefit to tax expense | $ 25 |  |
Restructuring and impairment costs | 158 | $ 78 |
Transaction and integration costs | 50 | 130 |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Amount | $ 24 | 14 |
Blended 2018 U.S. Effective Tax Rate [Member] |  |  |
Income Taxes, Additional Information [Line Items] |  |  |
U.S. federal statutory income tax rate | 25.00% |  |
U.S. Effective Tax Rate, Prior to Enacted Tax Reform [Member] |  |  |
Income Taxes, Additional Information [Line Items] |  |  |
U.S. federal statutory income tax rate | 35.00% |  |
Change in Entity Status [Domain] |  |  |
Income Taxes, Additional Information [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | 101 |
Transaction and integration costs [Member] |  |  |
Income Taxes, Additional Information [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 7 | $ 11 |
Other Property [Member] | Blended 2018 U.S. Effective Tax Rate [Member] |  |  |
Income Taxes, Additional Information [Line Items] |  |  |
U.S. federal statutory income tax rate | 8.00% |  |
Cash [Member] | Blended 2018 U.S. Effective Tax Rate [Member] |  |  |
Income Taxes, Additional Information [Line Items] |  |  |
U.S. federal statutory income tax rate | 15.50% |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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