Goodwill and Other Intangible Assets - Future Amortization Expense (Details 8) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	$ 579
2014	360
2015	170
2016	142
2017	133
Amortization of Intangible Assets	152	193
Purchased Credit Card Relationships [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	192
2014	91
2015	7
2016	4
2017	1
Amortization of Intangible Assets	53	69
Other credit card- related intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	57
2014	49
2015	39
2016	34
2017	29
Amortization of Intangible Assets	14	27
Core Deposit Intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	196
2014	102
2015	26
2016	14
2017	13
Amortization of Intangible Assets	50	61
Other intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	134
2014	118
2015	98
2016	90
2017	90
Amortization of Intangible Assets	$ 35	$ 36