Asset Quality (Credit Card and Other Consumer Loan Classes Asset Quality Indicators) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Total Loans	$ 181,864	[1],[2],[3],[4]	$ 159,014	[1],[2],[3],[4]	$ 154,543
Credit Card [Member]
Total Loans	4,135		3,976
Weighted-average updated FICO score	724		723
Higher Risk Loans	33		49
Other Consumer [Member]
Total Loans	21,268		19,166
Weighted-average updated FICO score	741		739
FICO score greater than 719 | Credit Card [Member]
Total Loans	2,117		2,016
Percent of Total Loans Using FICO Credit Metrics (%)	51.00%		51.00%
FICO score greater than 719 | Other Consumer [Member]
Total Loans	7,172		5,556
Percent of Total Loans Using FICO Credit Metrics (%)	58.00%		61.00%
FICO score of 650 to 719 [Member] | Credit Card [Member]
Total Loans	1,157		1,100
Percent of Total Loans Using FICO Credit Metrics (%)	28.00%		28.00%
FICO score of 650 to 719 [Member] | Other Consumer [Member]
Total Loans	2,885		2,125
Percent of Total Loans Using FICO Credit Metrics (%)	23.00%		23.00%
FICO score of 620 to 649 [Member] | Credit Card [Member]
Total Loans	193		184
Percent of Total Loans Using FICO Credit Metrics (%)	5.00%		5.00%
FICO score of 620 to 649 [Member] | Other Consumer [Member]
Total Loans	428		370
Percent of Total Loans Using FICO Credit Metrics (%)	4.00%		4.00%
FICO score of less Than 620 [Member] | Credit Card [Member]
Total Loans	267		284
Percent of Total Loans Using FICO Credit Metrics (%)	6.00%		7.00%
FICO score of less Than 620 [Member] | Other Consumer [Member]
Total Loans	555		548
Percent of Total Loans Using FICO Credit Metrics (%)	5.00%		6.00%
No FICO score available or required [Member] | Credit Card [Member]
Total Loans	401		392
Percent of Total Loans Using FICO Credit Metrics (%)	10.00%		9.00%
No FICO score available or required [Member] | Other Consumer [Member]
Total Loans	1,354		574
Percent of Total Loans Using FICO Credit Metrics (%)	10.00%		6.00%
Total Loans Using FICO Credit Metric [Member] | Credit Card [Member]
Total Loans	4,135		3,976
Percent of Total Loans Using FICO Credit Metrics (%)	100.00%		100.00%
Total Loans Using FICO Credit Metric [Member] | Other Consumer [Member]
Total Loans	12,394		9,173
Percent of Total Loans Using FICO Credit Metrics (%)	100.00%		100.00%
Other Internal Credit Metrics [Member] | Other Consumer [Member]
Total Loans	$ 8,874		$ 9,993
Pennsylvania [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	13.00%		13.00%
Ohio [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	20.00%		20.00%
Illinois [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	8.00%		7.00%
Michigan [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	12.00%		14.00%
Indiana [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	6.00%		7.00%
Florida [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	6.00%		6.00%
Kentucky [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	4.00%		5.00%
New Jersey [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	5.00%
North Carolina [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	4.00%
All Other States Maximum [Member] | Credit Card [Member]
Percentage Of Higher Risk Credit Card Loans	4.00%		4.00%

[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[2] Amounts represent items for which the Corporation has elected the fair value option.

[3] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $2.9 billion and $2.3 billion atSeptember 30, 2012 and December 31, 2011, respectively.

[4] Future accretable yield related to purchased impaired loans is not included in loans outstanding.