Derivative Financial Instruments - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Liability, Fair Value, Gross Liability	$ 5,673,000,000	$ 7,514,000,000
Derivative Liability, Fair Value of Collateral	864,000,000	1,259,000,000
Derivative Asset, Fair Value, Gross Asset	6,125,000,000	8,656,000,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		60,000,000
Executed equity forward agreement underlying shares		60
Sold equity forward agreement underlying shares		59
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net		1,000,000	2,000,000
Contributed equity forward agreement underlying shares		1
Net gain on sale of certain other equity securities		1,900,000,000
Gain (Loss) on Contract Termination		(305,000,000)
Cash Flow Hedging
Deferred net gains on derivatives that are recorded in AOCI are expected to be reclassified to net interest income over the next twelve months in connection with the recognition of interest income or interest expense on these hedged items	371,000,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	327,000,000	(28,000,000)	423,000,000
written risk participations [Member]
Minimum Term of Credit Risk Derivatives	1 year	1 year
Maximum Term of Credit Risk Derivatives	12 years	10 years
Weighted Average Term of Credit Risk Derivatives	6.9	4.4
Credit and Market Risk
Derivative asset positions	1,000,000,000	1,800,000,000
Net derivative asset positions to which the Company was exposed to risk of its counterparties, netted by counterparty where formal netting arrangements exist	1,500,000,000	2,600,000,000
Collateral Held by The Company Against Derivative Asset Positions	500,000,000	800,000,000
Adjusted the fair value of its net derivative asset position for estimates of counterparty credit risk	16,000,000	29,000,000
Derivative Liability, Fair Value, Gross Liability	941,000,000	1,300,000,000
Credit and Market Risk | Additional Termination Event [Member]
Derivative Liability, Fair Value, Gross Liability	3,000,000
Credit and Market Risk | Additional Termination Event [Member] | Credit Downgrade [Member]
Derivative Liability, Fair Value, Gross Liability	9,000,000
Credit and Market Risk | Credit Support Annex
Derivative Liability, Fair Value, Gross Liability	938,000,000
Credit and Market Risk | Credit Support Annex | Credit Downgrade [Member]
Posted collateral	10,000,000
Credit Default Swap
Minimum Term of Credit Risk Derivatives		1 year
Maximum Term of Credit Risk Derivatives	4 years	3 years
Maximum exposure	60,000,000	52,000,000
Derivative, Notional Amount	70,000,000	175,000,000
Credit Risk Derivatives, at Fair Value, Net	3,000,000	1,000,000
Credit Derivatives Swap Participation
Maximum exposure	33,000,000	20,000,000
Credit Risk Derivatives, at Fair Value, Net	1,000,000	1,000,000
Cash Flow Derivatives Hedges [Member]
Derivative, Lower Remaining Maturity Range	1 year	1 year
Derivative, Higher Remaining Maturity Range	5 years	5 years
Weighted Average of Maturities of Cash Flow Hedges	2.0	2.4
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	1,000,000	1,000,000
Total Return Swap
Derivative Liability, Fair Value, Gross Liability	31,000,000	46,000,000
Derivative, Notional Amount	1,500,000,000	1,900,000,000
Derivative Asset, Fair Value, Gross Asset	35,000,000	51,000,000
Collateral held	228,000,000	282,000,000
Derivatives Sold | Credit Default Swap
Credit Risk Derivatives, at Fair Value, Net	3,000,000	1,000,000
Interest Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 90,000,000	$ 171,000,000	$ 202,000,000