Goodwill and Other Intangible Assets - Future Amortization Expense (Details 8) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011	$ 748
2012	653
2013	436
2014	247
2015	148
Purchased Credit Card Relationships [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011	253
2012	213
2013	109
2014	23
2015	4
Other credit card- related intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011	108
2012	105
2013	103
2014	95
2015	34
Core Deposit Intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011	240
2012	195
2013	102
2014	26
2015	14
Other intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011	147
2012	140
2013	122
2014	103
2015	$ 96