Portfolio Balances and Delinquency Balances Based on 90 days or more Past Due and Net Charge-Offs Related to Managed Portfolio Loans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011	Dec. 31, 2011
Principal Balance	$ 236,848			$ 238,815
Past Due	7,772			8,284
Net Charge-offs	429		584
Loans
Principal Balance	122,691			122,495
Past Due	4,801			4,931
Net Charge-offs	422		571
Loans | Commercial Portfolio Segment
Principal Balance	56,185			55,872
Past Due	827			938
Net Charge-offs	101		156
Loans | Residential Mortgage Loans
Principal Balance	46,496			46,660
Past Due	2,975			3,079
Net Charge-offs	297		380
Loans | Consumer Portfolio Segment
Principal Balance	20,010			19,963
Past Due	999			914
Net Charge-offs	24		35
Managed Securitized Loans | Commercial Portfolio Segment
Principal Balance	1,987			1,978
Past Due	32			43
Net Charge-offs	0		0
Managed Securitized Loans | Residential Mortgage Loans
Principal Balance	112,170			114,342
Past Due	2,939	[1]		3,310	[1]
Net Charge-offs	$ 7		$ 13

[1] Excludes loans that have completed the foreclosure or short sale process (i.e., involuntary prepayments).