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	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010	Dec. 31, 2010
Principal Balance	$ 238,731			$ 238,731			$ 238,648
Past Due	8,853			8,853			9,216
Net Charge-offs	504		702	1,607		2,289
Loans
Principal Balance	117,475			117,475			115,975
Past Due	5,063			5,063			5,675
Net Charge-offs	492		690	1,568		2,233
Loans | Commercial Portfolio Segment
Principal Balance	54,705			54,705			53,488
Past Due	1,272			1,272			1,904
Net Charge-offs	185		231	520		622
Loans | Residential Mortgage Loans
Principal Balance	44,992			44,992			46,521
Past Due	3,073			3,073			3,122
Net Charge-offs	279		428	956		1,496
Loans | Consumer Portfolio Segment
Principal Balance	17,778			17,778			15,966
Past Due	718			718			649
Net Charge-offs	28		31	92		115
Managed Securitized Loans | Commercial Portfolio Segment
Principal Balance	2,001			2,001			2,244
Past Due	55			55			44
Net Charge-offs	0		0	0		22
Managed Securitized Loans | Residential Mortgage Loans
Principal Balance	119,255			119,255			120,429
Past Due	3,735	[1]		3,735	[1]		3,497	[1]
Net Charge-offs	$ 12		$ 12	$ 39		$ 34

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