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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Other Loss (AOCL) by Component
Changes in accumulated other comprehensive loss (AOCL), net of tax, by component for the three months ended December 31, 2017 and 2016, are as follows:
(in millions)
Foreign Exchange Translation Adjustment
 
Pension and Other Postretirement Adjustments (1)
 
Change in the Fair Value of Effective Cash Flow Hedges
 
Total
Balance at September 30, 2017
$
1

 
$
(1,575
)
 
$
(1
)
 
$
(1,575
)
Other comprehensive income (loss) before reclassifications
15

 
—

 
(1
)
 
14

Amounts reclassified from accumulated other comprehensive loss
—

 
14

 
(1
)
 
13

Net current period other comprehensive income (loss)
15

 
14

 
(2
)
 
27

Balance at December 31, 2017
$
16

 
$
(1,561
)
 
$
(3
)
 
$
(1,548
)
 
 
 
 
 
 
 
 
Balance at September 30, 2016
$
(76
)
 
$
(1,818
)
 
$
(4
)
 
$
(1,898
)
Other comprehensive loss before reclassifications
(21
)
 
—

 
(4
)
 
(25
)
Amounts reclassified from accumulated other comprehensive loss
—

 
16

 
1

 
17

Net current period other comprehensive income (loss)
(21
)
 
16

 
(3
)
 
(8
)
Balance at December 31, 2016
$
(97
)
 
$
(1,802
)
 
$
(7
)
 
$
(1,906
)
(1) Reclassifications from AOCL to net income, related to the amortization of net actuarial losses and prior service credits for the Company's retirement benefit plans, were $22 million ($14 million net of tax) and $25 million ($16 million net of tax) for the three months ended December 31, 2017 and 2016, respectively. The reclassifications are included in the computation of net benefit expense. See Note 8 for additional details.