Goodwill and Other Intangible Assets - Other Intangible Assets (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Intangible Assets By Major Class [Line Items]
Commercial Real Estate, Fair Value, Period Increase (Decrease)	$ (2)	$ (2)
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	3,029		3,207
Increase (Decrease) In Other Intangible Assets	(178)
Amortization of intangibles	193	217
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	3,775		3,826
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	3,240		3,224
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	535	602	602
Amortization of intangibles	69	80
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	850		844
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	383		356
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	467	488	488
Amortization of intangibles	27	26
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		4,133
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	3,600		3,539
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	533	594
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	2,418		2,467
Components of credit card relationships, core deposits and other intangible assets , Accumulated amortization	924		944
Components of credit card relationships, core deposits and other intangible assets , Net Carrying Value	$ 1,494	$ 1,523