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Derivative Instruments and Hedging Activities - Summary of Notional Amounts for Hedged Items, Designated as Hedge Accounting (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional amounts of hedge	$ 1,588	$ 2,088
Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedge [Member]
Derivative [Line Items]
Notional amounts of hedge	588	588
Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Designated as Hedging Instrument [Member] | Net Investment Hedge [Member]
Derivative [Line Items]
Notional amounts of hedge	$ 1,000	1,000
Asset Derivatives - Options and Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedge [Member]
Derivative [Line Items]
Notional amounts of hedge		$ 500

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- 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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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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