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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
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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 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 + Details
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