Goodwill and Other Intangible Assets - Future Amortization Expense (Details 8) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	$ 577
2014	358
2015	168
2016	141
2017	131
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
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
Core Deposits [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
Other intangibles [Member]
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2013	132
2014	116
2015	96
2016	89
2017	$ 88