Allowance for Credit Losses (Schedule of Information Regarding Impaired Loans) (Details) (USD $) In Millions				6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended				6 Months Ended		6 Months Ended		6 Months Ended				6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended				6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Jun. 30, 2011 Commercial and Industrial [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial and Industrial [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Commercial Real Estate - Other [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial Real Estate - Other [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Commercial Real Estate - Residential ADC [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial Real Estate - Residential ADC [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Commercial Specialized Lending [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial Specialized Lending [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Direct Retail Lending [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Direct Retail Lending [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Retail Revolving Credit [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Retail Revolving Credit [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Retail Residential Mortgage [Member] With A Related Allowance Recorded [Member]		Dec. 31, 2010 Retail Residential Mortgage [Member] With A Related Allowance Recorded [Member]		Jun. 30, 2011 Retail Sales Finance [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Retail Sales Finance [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 Retail Specialized Lending [Member] With A Related Allowance Recorded [Member]	Dec. 31, 2010 Retail Specialized Lending [Member] With A Related Allowance Recorded [Member]	Jun. 30, 2011 With A Related Allowance Recorded [Member]		Dec. 31, 2010 With A Related Allowance Recorded [Member]		Jun. 30, 2011 Commercial and Industrial [Member] With No Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial and Industrial [Member] With No Related Allowance Recorded [Member]	Jun. 30, 2011 Commercial Real Estate - Other [Member] With No Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial Real Estate - Other [Member] With No Related Allowance Recorded [Member]	Jun. 30, 2011 Commercial Real Estate - Residential ADC [Member] With No Related Allowance Recorded [Member]	Dec. 31, 2010 Commercial Real Estate - Residential ADC [Member] With No Related Allowance Recorded [Member]	Jun. 30, 2011 Direct Retail Lending [Member] With No Related Allowance Recorded [Member]	Dec. 31, 2010 Direct Retail Lending [Member] With No Related Allowance Recorded [Member]	Jun. 30, 2011 Retail Residential Mortgage [Member] With No Related Allowance Recorded [Member]		Dec. 31, 2010 Retail Residential Mortgage [Member] With No Related Allowance Recorded [Member]		Jun. 30, 2011 Retail Sales Finance [Member] With No Related Allowance Recorded [Member]	Jun. 30, 2011 Retail Specialized Lending [Member] With No Related Allowance Recorded [Member]	Jun. 30, 2011 Commercial and Industrial [Member]	Dec. 31, 2010 Commercial and Industrial [Member]	Jun. 30, 2011 Commercial Real Estate - Residential ADC [Member]	Dec. 31, 2010 Commercial Real Estate - Residential ADC [Member]	Jun. 30, 2011 Commercial Real Estate - Other [Member]	Dec. 31, 2010 Commercial Real Estate - Other [Member]	Jun. 30, 2011 Commercial Specialized Lending [Member]	Dec. 31, 2010 Commercial Specialized Lending [Member]	Jun. 30, 2011 Direct Retail Lending [Member]	Dec. 31, 2010 Direct Retail Lending [Member]	Jun. 30, 2011 Retail Revolving Credit [Member]	Dec. 31, 2010 Retail Revolving Credit [Member]	Jun. 30, 2011 Retail Residential Mortgage [Member]	Dec. 31, 2010 Retail Residential Mortgage [Member]	Jun. 30, 2011 Retail Sales Finance [Member]	Dec. 31, 2010 Retail Sales Finance [Member]	Jun. 30, 2011 Retail Specialized Lending [Member]	Dec. 31, 2010 Retail Specialized Lending [Member]	Jun. 30, 2011 Government Guaranteed Loans [Member]	Dec. 31, 2010 Government Guaranteed Loans [Member]
Recorded Investment				$ 548	$ 512	$ 477	$ 516	$ 384	$ 484	$ 6	$ 4	$ 150	$ 155	$ 62	$ 62	$ 611	[1]	$ 663	[1]	$ 6	$ 5	$ 36	$ 24	$ 2,819	[1]	$ 3,043	[1]	$ 163	$ 196	$ 143	$ 175	$ 181	$ 200	$ 24	$ 22	$ 25	[1]	$ 25	[1]	$ 1	$ 2																			$ 160	$ 115
Unpaid Principal Balance				581	534	519	565	418	556	6	4	159	161	61	61	626	[1]	690	[1]	7	5	38	24	3,300	[1]	3,532	[1]	237	267	194	246	317	300	82	69	50	[1]	50	[1]	1	4
Related Allowance	2,516	2,708	2,723	108	96	93	63	82	75	1	1	32	26	26	25	133	[1]	153	[1]	1	1	17	2	493	[1]	442	[1]															474	621	382	469	462	446	13	21	233	246	103	109	347	298	42	47	171	177	15	14
Average Recorded Investment				445		438		317		3		138		61		594	[1]			4		22		2,578	[1]			147		141		206		27		27	[1]			2	6
Interest Income Recognized				$ 2		$ 4		$ 2				$ 4		$ 1		$ 14	[1]					$ 1		$ 28	[1]

[1] Residential mortgage loans exclude $160 million and $115 million in government guaranteed loans and related allowance of $15 million and $14 million as of June 30, 2011 and December 31, 2010, respectively.