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Income Taxes (Tables) | 3 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Summary of Changes in Unrecognized Tax Benefits | Changes in unrecognized tax benefits are summarized as follows for the three months ended December 31, 2018.
(In millions) |  |  |
Balance at October 1, 2018 | $ | 164 |
Decreases related to positions taken on items from prior years |  | (1 | )
Increases related to positions taken in the current year |  | 1 |
Lapse of statute of limitations |  | (1 | )
Balance at December 31, 2018 | $ | 163 |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=109238393&loc=d3e36027-109320 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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