Goodwill and Other Intangible Assets - Amortization Expense (Details 7) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	$ 212	$ 218	$ 641	$ 696
Purchased Credit Card Relationships [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	69	80	226	274
Other credit card- related intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	27	26	80	78
Core Deposit Intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	72	82	216	248
Other intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	$ 44	$ 30	$ 119	$ 96