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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
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

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.

+ Details

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