Fair Value Measurements - Fair Value Hierarchy Level within which Fair Value of Financial and Non-Financial Assets has Been Recorded (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	$ (677)		$ (148)
Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	20		24
Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	556		722
Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	164		222
Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	740		968
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	4	[1]	(6)	[1]
Residential Mortgage [Member] | Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[1]	0	[1]
Residential Mortgage [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	9	[1]	10	[1]
Residential Mortgage [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	56	[1]	67	[1]
Residential Mortgage [Member] | Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	65	[1]	77	[1]
Impaired loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	26	[2]	(31)	[2]
Impaired loans [Member] | Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[2]	0	[2]
Impaired loans [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[2]	0	[2]
Impaired loans [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	108	[2]	155	[2]
Impaired loans [Member] | Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	108	[2]	155	[2]
Impaired Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	(90)	[3]	(114)	[3]
Impaired Consumer Loans [Member] | Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[3]	0	[3]
Impaired Consumer Loans [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	492	[3]	712	[3]
Impaired Consumer Loans [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[3]	0	[3]
Impaired Consumer Loans [Member] | Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	492	[3]	712	[3]
Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	0	[4]	3	[4]
Commercial real estate [Member] | Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	20	[4]	24	[4]
Commercial real estate [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[4]	0	[4]
Commercial real estate [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[4]	0	[4]
Commercial real estate [Member] | Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	20	[4]	24	[4]
Commercial Loans Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	(1)	[5]
Commercial Loans Held for Sale [Member] | Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[5]
Commercial Loans Held for Sale [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	55	[5]
Commercial Loans Held for Sale [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[5]
Commercial Loans Held for Sale [Member] | Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	55	[5]
Goodwill [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gains (Losses)	(616)	[6]
Goodwill [Member] | Level 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[6]
Goodwill [Member] | Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[6]
Goodwill [Member] | Level 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	0	[6]
Goodwill [Member] | Estimate of Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Recurring Fair Volume Measurements	$ 0	[6]

[1] As of December 31, 2013 and 2012, the fair value of the loans held for sale was below cost. Certain residential mortgage loans held for sale have been classified as a Level 3 fair value measurement within the fair value hierarchy as the underlying real estate properties which determine fair value are illiquid assets as a result of market conditions and significant inputs in estimating fair value were unobservable. Additionally, the fair value of these properties is affected by, among other things, the location, the payment history and the completeness of the loan documentation.

[2] Certain commercial loans have undergone troubled debt restructurings and are considered impaired. As a matter of practical expedient, we measure the credit impairment of a collateral-dependent loan based on the fair value of the collateral asset. The collateral often involves real estate properties that are illiquid due to market conditions. As a result, these loans are classified as a Level 3 fair value measurement within the fair value hierarchy.

[3] Represents residential mortgage loans held for investment whose carrying amount was reduced during the periods presented based on the fair value of the underlying collateral.

[4] Real estate owned is required to be reported on the balance sheet net of transactions costs. The real estate owned amounts in the table above reflect the fair value unadjusted for transaction costs.

[5] Represents a project finance syndicated loan held for sale whose fair value was below cost as of December 31, 2013

[6] During the fourth quarter of 2013, goodwill with a carrying amount of $616 million allocated to our Global Banking & Markets business was written down to its implied fair value of $0 million.