Financial Instruments, Hedging Activities and Fair Value Measurements (Additional Information) (Detail) € in Billions	12 Months Ended
	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Aug. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Dec. 31, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Finance lease liability				$ 11,000,000
Foreign Currency Contracts, Liability, Fair Value Disclosure						$ 36,000,000
Notional Amount of Derivative Instruments Designated as Net Investment Hedges							$ 560,000,000
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net				48,000,000		35,000,000
Fair Value of Debt Instrument Designated as a Hedge of Net Investment in Foreign Operations				2,200,000,000		2,600,000,000
Derivative, Cash Received on Hedge			$ 3,000,000
Foreign Currency Contracts, Liability, Fair Value Disclosure				6,000,000
Accumulated pretax unrealized translation gains			$ 5,672,000,000	5,403,000,000		4,732,000,000		$ 4,915,000,000
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure				1,000,000		1,000,000
Notional Amount of Derivative Instruments Designated as Net Investment Hedges				43,000,000		50,000,000
Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges							575,000,000
Notional Amount of Nonderivative Instruments | €	€ 2.0	€ 2.3
Foreign Currency Contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges				2,800,000,000		2,500,000,000
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges							$ 525,000,000
Interest Rate Derivatives, at Fair Value, Net				35,000,000		8,000,000
Currency Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges					$ 300,000,000
Designated as Hedging Instrument | Foreign Currency Contracts | Cash Flow Hedging | Settlement Date 15 March 2018
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivative Instruments Designated as Net Investment Hedges						560,000,000
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Accumulated pretax unrealized translation gains				$ 235,000,000		$ 161,000,000