Shareholders' Equity (Tables)

3 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The components of AOCL and the changes in AOCL by components, net of tax, for the three months ended December 31, 2018 and 2017 are as follows (in millions):

	Foreign Currency Translation			Employee Benefit Related Adjustments			Unrealized Income (Loss)		Total
Balance at September 30, 2018	$	(90	)	$	(476	)	$	—	$	(566	)
Other comprehensive income before reclassification	(4		)	(1		)	—		(5		)
Amounts reclassified from accumulated other comprehensive loss	—			1			1		2
Net current-period other comprehensive income	$	(4	)	$	—		$	1	$	(3	)
Balance at December 31, 2018	$	(94	)	$	(476	)	$	1	$	(569	)

	Foreign Currency Translation			Employee Benefit Related Adjustments			Unrealized Loss			Total
Balance at September 30, 2017	$	(41	)	$	(500	)	$	(4	)	$	(545	)
Other comprehensive income (loss) before reclassification	(8		)	1			—			(7		)
Amounts reclassified from accumulated other comprehensive loss	—			2			—			2
Net current-period other comprehensive income (loss)	$	(8	)	$	3		$	—		$	(5	)
Balance at December 31, 2017	$	(49	)	$	(497	)	$	(4	)	$	(550	)

Reclassification out of accumulated other comprehensive income

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Consolidated Statement of Operations
Employee Benefit Related Adjustment
Prior service costs	$	(9	)	(b)
Actuarial losses	$	11		(b)
	2			Total before tax
	—			Tax benefit
Total reclassifications for the period	$	2		Net of tax
(b)  These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Note 20 for additional details), which is recorded in other operating income (expense).

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Consolidated Statement of Operations
Employee Benefit Related Adjustment
Prior service costs	$	(9	)	(a)
Actuarial losses	10			(a)
	1			Total before tax
	—			Tax benefit
Total reclassifications for the period	$	1		Net of tax
(a)  These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Note 20 for additional details), which is recorded in other operating income (expense).