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Derivative Instruments and Hedging Activities - Summary of Notional Amounts for Hedged Items, Designated as Hedge Accounting (Detail) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Notional amounts of hedge	$ 588	$ 588
Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Net Investment Hedge [Member]
Derivative [Line Items]
Notional amounts of hedge	1,000	1,000
Asset Derivatives - Options and Forward Contracts [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Notional amounts of hedge	$ 500	$ 500

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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