Goodwill and Other Intangible Assets - Other Intangible Assets (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intangible Assets By Major Class [Line Items]
Commercial Real Estate, Fair Value, Period Increase (Decrease)	$ (9)	$ (1)	$ (4)
Components of credit card relationships, core deposits and other intangible assets [Abstract]
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	3,207	4,039	4,621
Increase (Decrease) In Other Intangible Assets	(832)
Amortization of intangibles	848	936	1,050
Indefinite-Lived Intangible Assets (Excluding Goodwill)	600
Purchased Credit Card Relationships [Member]
Components of credit card relationships, core deposits and other intangible assets [Abstract]
Components of credit card relationships, core deposits and other intangible assets , Gross amount	3,826	5,789
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	3,224	4,892
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	602	897	1,246
Amortization of intangibles	295	355	421
Other credit card- related intangibles [Member]
Components of credit card relationships, core deposits and other intangible assets [Abstract]
Components of credit card relationships, core deposits and other intangible assets , Gross amount	844	907
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	356	314
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	488	593	691
Amortization of intangibles	106	111	94
Core Deposit Intangibles [Member]
Components of credit card relationships, core deposits and other intangible assets [Abstract]
Components of credit card relationships, core deposits and other intangible assets , Gross amount	4,133	4,280
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	3,539	3,401
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	594	879
Other intangibles [Member]
Components of credit card relationships, core deposits and other intangible assets [Abstract]
Components of credit card relationships, core deposits and other intangible assets , Gross amount	2,467	2,515
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	944	845
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	$ 1,523	$ 1,670