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Notional Amounts of Outstanding Derivative Positions (Detail) € in Millions, ₨ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions | Mar. 31, 2019 EUR (€) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 GBP (£) | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 CAD ($) | Mar. 31, 2019 SGD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 INR (₨) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 SGD ($)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | € 4,784 |  | £ 1,905 | ₨ 3,707 | $ 1,455 | $ 0 | € 4,924 |  | £ 2,037 | ₨ 3,642 | $ 1,443 | $ 20
Fixed to Floating Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 4,674 |  |  |  |  |  | $ 4,674 |  |  |  |
Floating to Fixed Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 778 |  |  |  |  |  | $ 778 |  |  |  |

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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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