Goodwill and Other Intangible Assets - Amortization Expense (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	$ 193	$ 217
Purchased Credit Card Relationships [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	69	80
Other credit card- related intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	27	26
Core Deposit Intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	61	72
Other intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	$ 36	$ 39