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Derivative Instruments and Hedging Activities (Details) ¥ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) instrument	Sep. 30, 2020 USD ($) instrument	Sep. 30, 2019 USD ($) instrument	Sep. 30, 2018 USD ($)	Sep. 30, 2020 EUR (€) instrument	Sep. 30, 2020 JPY (¥) instrument	Dec. 31, 2019 JPY (¥)	Sep. 30, 2019 JPY (¥) instrument	Sep. 30, 2018 EUR (€) instrument
Derivative [Line Items]
Percentage of foreign exchange rate exposure hedged, minimum		70.00%			70.00%	70.00%
Percentage of foreign exchange rate exposure hedged, maximum		90.00%			90.00%	90.00%
Cash collateral pledged		$ 0	$ 0
Cash collateral received		0	0
Reclassification out of accumulated other comprehensive income
Derivative [Line Items]
Realized and unrealized gains (losses) on derivatives	$ 2,000,000
Cross-currency interest rate swaps
Derivative [Line Items]
Proceeds from derivative instrument, investing activities	$ 10,000,000
Interest rate cap
Derivative [Line Items]
Notional value of derivative asset		$ 200,000,000
Number of instruments | instrument		2			2	2
Foreign currency exchange derivatives | Yanfeng
Derivative [Line Items]
Notional value of derivative asset | ¥						¥ 1,600
China | Foreign currency exchange derivatives
Derivative [Line Items]
Notional value of derivative asset | ¥							¥ 950
Net investment hedging | Foreign currency exchange derivatives
Derivative [Line Items]
Effective portion of pretax gains (loss) related to net investment hedges		$ (84,000,000)	74,000,000	$ 31,000,000
Gains (losses) reclassified into income for net investment hedges		$ 0	$ 0	0
Net investment hedging | Europe | Cross-currency interest rate swaps
Derivative [Line Items]
Notional value of derivative asset | €									€ 160,000,000
Number of instruments | instrument	1	0			0	0			2
Net investment hedging | Japan | Cross-currency interest rate swaps
Derivative [Line Items]
Notional value of derivative asset | ¥						¥ 11,000		¥ 11,000
Number of instruments | instrument		1	1		1	1		1
Cash flow hedging
Derivative [Line Items]
Gain (loss) for ineffective portion of cash flow hedge		$ (2,000,000)
Cash flow hedging | Foreign currency exchange derivatives
Derivative [Line Items]
Gain (loss) for ineffective portion of cash flow hedge		$ 0	$ 0	$ 0
Long-term debt | Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815
Derivative [Line Items]
Notional value of derivative liability | €					€ 1,000,000,000.0
Interest rate (as percent)		3.50%			3.50%	3.50%

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