Allowance For Loan And Lease Losses (Components Of Allowance For Loan And Lease Losses By Impairment Methodology) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	$ 3,586	[1]	$ 3,766	[1]
Asset-specific	435	[2]	458	[2]
Acquired loans	39		26
Total allowance for loan and lease losses	4,060		4,250
Formula-based	128,866	[1]	129,409	[1]
Asset-specific	1,825	[2]	1,798	[2]
Acquired loans	43,131		4,685
Total loans held-for-investment	173,822		135,892
Allowance as a percentage of period-end held-for-investment loans	2.34%		3.13%
Credit Card [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	2,337	[1]	2,494	[1]
Asset-specific	334	[2]	353	[2]
Acquired loans	0		0
Total allowance for loan and lease losses	2,671		2,847		3,576	4,041
Formula-based	60,609	[1]	64,177	[1]
Asset-specific	867	[2]	898	[2]
Acquired loans	0		0
Total loans held-for-investment	61,476		65,075
Allowance as a percentage of period-end held-for-investment loans	4.34%		4.37%
Consumer Auto [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	449	[1]	383	[1]
Asset-specific	10	[2]	8	[2]
Acquired loans	0		0
Total allowance for loan and lease losses	459		391		318	353
Formula-based	23,460	[1]	21,674	[1]
Asset-specific	70	[2]	58	[2]
Acquired loans	38		47
Total loans held-for-investment	23,568		21,779
Allowance as a percentage of period-end held-for-investment loans	1.95%		1.80%
Consumer Home Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	57	[1]	65	[1]
Asset-specific	9	[2]	10	[2]
Acquired loans	36		23
Total allowance for loan and lease losses	102		98		118	112
Formula-based	6,865	[1]	6,217	[1]
Asset-specific	102	[2]	104	[2]
Acquired loans	42,583		4,112
Total loans held-for-investment	49,550		10,433
Allowance as a percentage of period-end held-for-investment loans	0.21%		0.94%
Consumer Retail Banking [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	146	[1]	150	[1]
Asset-specific	10	[2]	12	[2]
Acquired loans	1		1
Total allowance for loan and lease losses	157		163		204	210
Formula-based	4,054	[1]	3,968	[1]
Asset-specific	88	[2]	90	[2]
Acquired loans	40		45
Total loans held-for-investment	4,182		4,103
Allowance as a percentage of period-end held-for-investment loans	3.75%		3.97%
Total Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	652	[1]	598	[1]
Asset-specific	29	[2]	30	[2]
Acquired loans	37		24
Total allowance for loan and lease losses	718		652		640	675
Formula-based	34,379	[1]	31,859	[1]
Asset-specific	260	[2]	252	[2]
Acquired loans	42,661		4,204
Total loans held-for-investment	77,300		36,315
Allowance as a percentage of period-end held-for-investment loans	0.93%		1.80%
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	562	[1]	638	[1]
Asset-specific	72	[2]	75	[2]
Acquired loans	2		2
Total allowance for loan and lease losses	636		715		785	830
Formula-based	33,738	[1]	33,198	[1]
Asset-specific	698	[2]	648	[2]
Acquired loans	470		481
Total loans held-for-investment	34,906		34,327
Allowance as a percentage of period-end held-for-investment loans	1.82%		2.08%
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Formula-based	35	[1]	36	[1]
Asset-specific	0	[2]	0	[2]
Acquired loans	0		0
Total allowance for loan and lease losses	35	[3]	36	[3]	66	82
Formula-based	140	[1]	175	[1]
Asset-specific	0	[2]	0	[2]
Acquired loans	0		0
Total loans held-for-investment	$ 140		$ 175
Allowance as a percentage of period-end held-for-investment loans	25.00%		20.57%

[1] The formula-based component of the allowance for credit card and other consumer loans that we collectively evaluate for impairment is based on a statistical calculation supplemented by judgment and interpretation. The formula-based component of the allowance for commercial loans that we collectively evaluate for impairment is based on our historical loss experience for loans with similar characteristics and consideration of credit quality supplemented by management judgment and interpretation.

[2] The asset specific component of the allowance for smaller-balance impaired loans is calculated on a pool basis using historical loss experience for the respective class of assets. The asset-specific component of the allowance for larger-balance, commercial loans is individually calculated for each loan.

[3] Other consists of our discontinued GreenPoint mortgage operations loan portfolio and our community redevelopment loan portfolio.