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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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Derivative [Line Items] |  |
Total Derivative Notional Values | $ 84,300,000,000 | $ 103,600,000,000
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 55,900,000,000 | 55,900,000,000
Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 16,500,000,000 | 35,100,000,000
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 8,900,000,000 | 9,400,000,000
Other [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 3,000,000,000 | 3,200,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 14,700,000,000 | 9,500,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 20,800,000,000 | 21,700,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 14,700,000,000 | 9,500,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 12,200,000,000 | 12,600,000,000
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 8,600,000,000 | 9,100,000,000
Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 48,800,000,000 | 72,400,000,000
Trading [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 29,000,000,000 | 33,800,000,000
Trading [Member] | Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 16,500,000,000 | 35,100,000,000
Trading [Member] | Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 300,000,000 | 300,000,000
Trading [Member] | Other [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | $ 3,000,000,000 | $ 3,200,000,000

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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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- 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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