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Notional Amounts of Outstanding Derivative Positions (Detail) € in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions | Sep. 30, 2018 USD ($) | Sep. 30, 2018 GBP (£) | Sep. 30, 2018 SGD ($) | Sep. 30, 2018 CAD ($) | Sep. 30, 2018 MXN ($) | Sep. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 SGD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 EUR (€)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | £ 1,713 | $ 41 | $ 1,433 | $ 0 | € 4,848 |  | £ 1,736 | $ 11 | $ 1,259 | $ 169 | € 4,942
Fixed to Floating Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 4,674 |  |  |  |  |  | $ 5,424 |  |  |  |  |
Floating to Fixed Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 778 |  |  |  |  |  | $ 778 |  |  |  |  |
Investment market price contracts |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  |  | € 0 |  |  |  |  |  | € 64

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- 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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