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Summary of Significant Accounting Policies - Other (Details) - USD ($) $ in Millions |  | 3 Months Ended
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Jan. 01, 2018 | Sep. 30, 2018
ASU 2016-01 | Accumulated Other Comprehensive Loss |  |
Recently Adopted Accounting Standards |  |
Adoption of ASU 2016-01 | $ (2) |
ASU 2016-01 | Retained Earnings |  |
Recently Adopted Accounting Standards |  |
Adoption of ASU 2016-01 | $ 2 |
ASU 2018-02 | Accumulated Other Comprehensive Loss |  |
Recently Adopted Accounting Standards |  |
Adoption of ASU 2018-02 |  | $ (5)
ASU 2018-02 | Retained Earnings |  |
Recently Adopted Accounting Standards |  |
Adoption of ASU 2018-02 |  | $ 5

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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