Loans Held for Investment portfolio and Related Allowance for Loan and Lease Losses (Detail) (USD $) In Millions	Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010		Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Individually evaluated	$ 3,914			$ 4,083
Collectively evaluated	110,550			111,400
Total evaluated	114,464			115,483
LHFI at fair value	449			492
Total	114,913	[1]		115,975	[1]
Individually evaluated	564			605
Collectively evaluated	2,180			2,369
Total evaluated	2,744			2,974
Total LHFI	2,744		2,854	2,974		3,156	3,176	3,120
Commercial Portfolio Segment
Individually evaluated	737			906
Collectively evaluated	52,628			52,578
Total evaluated	53,365			53,484
LHFI at fair value	4			4
Total	53,369			53,488
Individually evaluated	165			175
Collectively evaluated	1,035			1,128
Total evaluated	1,200			1,303
Total LHFI	1,200		1,255	1,303		1,447	1,399	1,353
Residential Mortgage Loans
Individually evaluated	3,164			3,166
Collectively evaluated	41,415			42,867
Total evaluated	44,579			46,033
LHFI at fair value	445			488
Total	45,024			46,521
Individually evaluated	397			428
Collectively evaluated	998			1,070
Total evaluated	1,395			1,498
Total LHFI	1,395		1,440	1,498		1,538	1,590	1,592
Consumer Portfolio Segment
Individually evaluated	13			11
Collectively evaluated	16,507			15,955
Total evaluated	16,520			15,966
Total	16,520			15,966
Individually evaluated	2			2
Collectively evaluated	147			171
Total evaluated	149			173
Total LHFI	$ 149		$ 159	$ 173		$ 171	$ 187	$ 175

[1] Includes loans of consolidated VIEs 2,896 2,869