Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Derivatives, Fair Value [Line Items]
Companys hedged interest rate transactions	4 years
Outstanding hedge contracts			$ 0
Deferred gain (loss) on derivative financial instruments	$ 3,000,000
Deferred gains (losses) in comprehensive loss related to foreign exchange hedging	0		0
Deferred (losses) gains on derivative financial instruments		$ (6,000,000)
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	820,000,000		820,000,000
Deferred gain (loss) on derivative financial instruments	(5,000,000)
Deferred (losses) gains on derivative financial instruments			$ (8,000,000)
Unrealized pre-tax (losses) gains on derivative financial instruments		(6,000,000)
Unrealized pre-tax (losses) gains on derivative financial instruments	4,000,000
Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Unrealized pre-tax (losses) gains on derivative financial instruments		(3,000,000)
Foreign Exchange Contract | Other Income (Expense)
Derivatives, Fair Value [Line Items]
Realized foreign exchange forward contract gain (loss)	(1,000,000)	0
Unrealized foreign exchange forward contract gain (loss)	(3,000,000)	$ 5,000,000
Sale
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	288,000,000
Purchase
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	$ 148,000,000