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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Total Derivative Notional Values	$ 69,600,000,000	$ 71,700,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member]
Derivative [Line Items]
Total Derivative Notional Values	16,400,000,000	16,700,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative [Line Items]
Total Derivative Notional Values	9,500,000,000	11,200,000,000
Trading [Member]
Derivative [Line Items]
Total Derivative Notional Values	43,700,000,000	43,800,000,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	54,900,000,000	51,000,000,000.0
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member]
Derivative [Line Items]
Total Derivative Notional Values	16,400,000,000	16,700,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative [Line Items]
Total Derivative Notional Values	7,300,000,000	7,500,000,000
Interest Rate Swaps [Member] | Trading [Member]
Derivative [Line Items]
Total Derivative Notional Values	31,200,000,000	26,800,000,000
Floor Income Contracts [Member]
Derivative [Line Items]
Total Derivative Notional Values	12,500,000,000	17,000,000,000.0
Floor Income Contracts [Member] | Trading [Member]
Derivative [Line Items]
Total Derivative Notional Values	12,500,000,000	17,000,000,000.0
Cross-Currency Interest Rate Swaps [Member]
Derivative [Line Items]
Total Derivative Notional Values	2,200,000,000	3,700,000,000
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative [Line Items]
Total Derivative Notional Values	$ 2,200,000,000	$ 3,700,000,000

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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.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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