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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
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Derivative [Line Items] |  |
Total Derivative Notional Values | $ 89,800,000,000 | $ 80,700,000,000
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 58,200,000,000 | 50,800,000,000
Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 21,400,000,000 | 18,500,000,000
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 7,900,000,000 | 8,800,000,000
Other [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 2,300,000,000 | 2,600,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 15,600,000,000 | 15,200,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 19,900,000,000 | 20,300,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 15,600,000,000 | 15,200,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 12,300,000,000 | 11,800,000,000
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 7,600,000,000 | 8,500,000,000
Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 54,300,000,000 | 45,200,000,000
Trading [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 30,300,000,000 | 23,800,000,000
Trading [Member] | Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 21,400,000,000 | 18,500,000,000
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 | $ 2,300,000,000 | $ 2,600,000,000

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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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