Goodwill and Other Intangible Assets - Amortization Expense (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	$ 637	$ 957	$ 848
Purchased credit card relationships [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	195	309	295
Other credit card- related intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	58	265	106
Core deposit intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	196	239	285
Other intangibles [Member]
Amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
Amortization expense	$ 188	$ 144	$ 162