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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Derivative [Line Items] |  |
Total Derivative Notional Values | $ 120,600,000,000 | $ 131,400,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 22,400,000,000 | 21,400,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 13,800,000,000 | 14,800,000,000
Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 84,400,000,000 | 95,200,000,000
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 95,100,000,000 | 98,600,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 22,400,000,000 | 21,400,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 9,600,000,000 | 10,300,000,000
Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 63,100,000,000 | 66,900,000,000
Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 21,200,000,000 | 27,900,000,000
Floor Income Contracts [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 21,200,000,000 | 27,900,000,000
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 4,200,000,000 | 4,700,000,000
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 4,200,000,000 | 4,500,000,000
Cross-Currency Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values |  | 200,000,000
Other [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 100,000,000 | 200,000,000
Other [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | $ 100,000,000 | $ 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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