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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Total Derivative Notional Values	$ 86,800,000,000	$ 103,600,000,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	58,200,000,000	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	9,100,000,000	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	20,300,000,000	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	11,500,000,000	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	8,800,000,000	9,100,000,000
Trading [Member]
Derivative [Line Items]
Total Derivative Notional Values	51,800,000,000	72,400,000,000
Trading [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	32,000,000,000	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

X

- 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

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X

- 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.

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