Fair Values of Assets and Liabilities (Details 1) (USD $) In Millions	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Assets, Fair Value Disclosure
Mortgage loans held for sale	$ 3,300
Mortgage servicing rights	1,989	2,073	1,837	1,543	1,778	1,749
Residential [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Level 1 [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Level 1 [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Level 1 [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	854		1,054
Mortgage loans held for sale	0		0
Mortgage servicing rights	0		0
Derivative assets	0		0
Other assets	0		0
Total	854		1,054
Liabilities, Fair Value Disclosure
Derivative liabilities	0		0
Other liabilities	0		0
Total	0		0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	632
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	222
Level 1 [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			873
Level 1 [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 1 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			181
Residential [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	39,072
Residential [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Level 2 [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			37,703
Residential [Member] | Level 2 [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Level 2 [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	49,333		48,078
Mortgage loans held for sale	3,304		8,100
Mortgage servicing rights	0		0
Derivative assets	724		846
Other assets	806		470
Total	54,167		57,494
Liabilities, Fair Value Disclosure
Derivative liabilities	2,077		2,072
Other liabilities	785		470
Total	2,862		2,542
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	1,241
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	158
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	94
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	583
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	6,682
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	6
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	1,013
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	475
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	9
Level 2 [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			1,664
Level 2 [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			197
Level 2 [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 2 [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			89
Level 2 [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			587
Level 2 [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			6,417
Level 2 [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			6
Level 2 [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			949
Level 2 [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			448
Level 2 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			18
Residential [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	896
Residential [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	895
Residential [Member] | Level 3 [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Level 3 [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			1,103
Residential [Member] | Level 3 [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			947
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	2,112		2,377
Mortgage loans held for sale	0		0
Mortgage servicing rights	1,989		1,837
Derivative assets	889		953
Other assets	0		0
Total	4,990		5,167
Liabilities, Fair Value Disclosure
Derivative liabilities	53		102
Other liabilities	0		0
Total	53		102
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	50
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	133
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	129
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	9
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Level 3 [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 3 [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 3 [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			50
Level 3 [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			135
Level 3 [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			133
Level 3 [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 3 [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 3 [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			9
Level 3 [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Level 3 [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Netting [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Netting [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Netting [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Residential [Member] | Netting [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Netting [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Netting [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0		0
Mortgage loans held for sale	0		0
Mortgage servicing rights	0		0
Derivative assets	(366)		(280)
Other assets	0		0
Total	(366)		(280)
Liabilities, Fair Value Disclosure
Derivative liabilities	(1,181)		(1,163)
Other liabilities	0		0
Total	(1,181)		(1,163)
Netting [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	0
Netting [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Netting [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			0
Residential [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	39,072
Residential [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	896
Residential [Member] | Fair Value, Measurements, Recurring [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	895
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	52,299		51,509
Mortgage loans held for sale	3,304		8,100
Mortgage servicing rights	1,989		1,837
Derivative assets	1,247		1,519
Other assets	806		470
Total	59,645		63,435
Liabilities, Fair Value Disclosure
Derivative liabilities	949		1,011
Other liabilities	785		470
Total	1,734		1,481
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	1,873
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	158
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	50
Fair Value, Measurements, Recurring [Member] | Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	227
Fair Value, Measurements, Recurring [Member] | Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	712
Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	6,682
Fair Value, Measurements, Recurring [Member] | Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	6
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	1,022
Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	475
Fair Value, Measurements, Recurring [Member] | Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities	231
Residential [Member] | Agency [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			37,703
Residential [Member] | Non agency Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			1,103
Residential [Member] | Non agency Non Prime [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			947
U.S. Treasury and agencies [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			2,537
Commercial Mortgage Backed Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			197
Commercial Mortgage Backed Non-Agency Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			50
Collateralized Loan Obligations [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			224
Others [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			720
Obligations of state and political subdivisions [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			6,417
Obligations of foreign governments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			6
Corporate Debt Securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			958
Perpetual preferred securities [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			448
Other Investments [Member]
Assets, Fair Value Disclosure
Available-for-sale securities			$ 199