Goodwill and Other Intangible Assets - Future Amortization Expense (Details 8) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011			$ 836
Amortization expense	212	218	641	696
2012			733
2013			638
2014			420
2015			233
Purchased Credit Card Relationships [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011			294
Amortization expense	69	80	226	274
2012			252
2013			212
2014			108
2015			22
Other credit card- related intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011			105
Amortization expense	27	26	80	78
2012			105
2013			102
2014			100
2015			92
Core Deposit Intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011			284
Amortization expense	72	82	216	248
2012			240
2013			195
2014			100
2015			25
Other intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2011			153
Amortization expense	44	30	119	96
2012			136
2013			129
2014			112
2015			$ 94