Goodwill and Other Intangible Assets - Changes in the Carrying Amounts of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Servicing Asset at Fair Value, Amount	$ 1,300		$ 899
Amortization	(23)		(39)
Origination of Mortgage Servicing Rights (MSRs)	352		336		224
Due to changes in inputs or assumptions	302	[1]	(112)	[1]
Servicing Asset at Fair Value, Other Changes in Fair Value	(252)	[2]	(241)	[2]
Servicing Asset at Fair Value, Disposals	1		5
Ending Balance	1,334		956		1,017
Mortgage Servicing Rights, Fair Value [Member]
Servicing Asset at Fair Value, Amount	1,300		899		921
Amortization	0		0
Origination of Mortgage Servicing Rights (MSRs)	352		336
Due to changes in inputs or assumptions	302	[1]	(112)	[1]
Servicing Asset at Fair Value, Other Changes in Fair Value	(252)	[2]	(241)	[2]
Servicing Asset at Fair Value, Disposals	1		5
Other Intangible Assets [Member]
Amortization	(10)		(18)
Origination of Mortgage Servicing Rights (MSRs)	0		0
Due to changes in inputs or assumptions	0		0
Servicing Asset at Fair Value, Other Changes in Fair Value	0		0
Servicing Asset at Fair Value, Disposals	0		0
Ending Balance	30		40		58
Core Deposits [Member]
Amortization	(13)		(21)
Origination of Mortgage Servicing Rights (MSRs)	0		0
Due to changes in inputs or assumptions	0		0
Servicing Asset at Fair Value, Other Changes in Fair Value	0		0
Servicing Asset at Fair Value, Disposals	0		0
Ending Balance	$ 4		$ 17		$ 38

[1] Primarily reflects changes in discount rates and prepayment speed assumptions, due to changes in interest rates.

[2] Represents changes due to the collection of expected cash flows, net of accretion, due to the passage of time.