Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
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- Definition

Amount of expense line items presented in consolidated statement of income in which effects of fair value or cash flow hedges are recorded.

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Amount of income line items presented in consolidated statement of income in which effects of fair value or cash flow hedges are recorded.

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Derivative Instruments - Effect of Fair Value and Cash Flow Hedge Accounting on Consolidated Statement of Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total amount of income line items presented in the Consolidated Statement of Income in which the effects of fair value or cash flow hedges are recorded	$ 207	$ 195	$ 374	$ 375
Other Noninterest Income [Member] \| Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedged item		(14)		(4)
Other Noninterest Income [Member] \| Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member] \| Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedge		14		4
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total amount of expense line items presented in the Consolidated Statement of Income in which the effects of fair value or cash flow hedges are recorded	751	470	1,374	883
Interest Expense [Member] \| Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedged item	(48)		(5)
Interest Expense [Member] \| Asset and Liability Management Positions [Member] \| Fair Value Hedges [Member] \| Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to fair value hedge	48		5
Interest Expense [Member] \| Asset and Liability Management Positions [Member] \| Cash Flow Hedges [Member] \| Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gains (Losses) Recognized in Earnings related to cash flow hedge	$ (2)	$ 10	$ 1	$ 24