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INCOME TAXES (Tables)
6 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]  
Summary of Changes in Unrecognized Tax Benefits
Changes in unrecognized tax benefits are summarized as follows for the six months ended March 31, 2017.
 (In millions)
 

Balance at October 1, 2016
$
168

Increases related to positions taken on items from prior years
5

Decreases related to positions taken on items from prior years
(2
)
Increases related to positions taken in the current year
7

Lapse of the statute of limitations
(2
)
Settlement of uncertain tax positions with tax authorities
(1
)
Balance at March 31, 2017
$
175