The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Section 45

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Intangible Assets, Amortization Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year ended December 31, 2012 (actual)	$ 1,674	$ 1,880	$ 2,199
Estimate for year ended December 31,
2013	1,743
2014	1,568
2015	1,427
2016	1,276
2017	1,147
Finite Lived Intangible Assets [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year ended December 31, 2012 (actual)	1,915
Amortized MSRs [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year ended December 31, 2012 (actual)	233
Estimate for year ended December 31,
2013	235
2014	204
2015	178
2016	145
2017	101
Core deposit intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year ended December 31, 2012 (actual)	1,396
Estimate for year ended December 31,
2013	1,241
2014	1,113
2015	1,022
2016	919
2017	851
Customer Relationships And Other [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year ended December 31, 2012 (actual)	286
Estimate for year ended December 31,
2013	267
2014	251
2015	227
2016	212
2017	$ 195