Loans Held for Investment portfolio and Related Allowance for Loan and Lease Losses (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011		Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Individually evaluated	$ 3,385			$ 3,592
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	381			448
Collectively evaluated	120,769			118,470
Total evaluated	124,154			122,062
Loans carried at fair value	406			433
Total	124,560	[1]		122,495	[1]
Individually evaluated	381			448
Collectively evaluated	1,919			2,009
Total evaluated	2,300			2,457
Total LHFI	2,300		2,348	2,457		2,744	2,854	2,974
Commercial Portfolio Segment [Member]
Individually evaluated	318			412
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	18			34
Collectively evaluated	57,495			55,458
Total evaluated	57,813			55,870
Loans carried at fair value	1			2
Total	57,814			55,872
Individually evaluated	18			34
Collectively evaluated	869			930
Total evaluated	887			964
Total LHFI	887		901	964		1,200	1,255	1,303
Residential Portfolio Segment [Member]
Individually evaluated	3,016			3,141
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	355			405
Collectively evaluated	42,781			43,088
Total evaluated	45,797			46,229
Loans carried at fair value	405			431
Total	46,202			46,660
Individually evaluated	355			405
Collectively evaluated	922			949
Total evaluated	1,277			1,354
Total LHFI	1,277		1,315	1,354		1,395	1,440	1,498
Consumer Portfolio Segment [Member]
Individually evaluated	51			39
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	8			9
Collectively evaluated	20,493			19,924
Total evaluated	20,544			19,963
Loans carried at fair value	0			0
Total	20,544			19,963
Individually evaluated	8			9
Collectively evaluated	128			130
Total evaluated	136			139
Total LHFI	$ 136		$ 132	$ 139		$ 149	$ 159	$ 173

[1] Includes loans of consolidated VIEs390 3,322