Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010		Jun. 30, 2010
Assets:
Residential mortgage loans held for sale	$ 978		$ 1,892		$ 1,747
Residential mortgage loans	59	[1]	46	[1]	41	[1]
Derivative assets	1,964		2,074		2,331
Total assets	17,879		18,852		19,516
Liabilities:
Derivative liabilities	1,157		1,314		1,368
Short positions	12		2		7
Total liabilities	1,169		1,316		1,375
Available-for-sale Securities | US Treasury and Government | Fair Value, Inputs, Level 1
Assets:
Securities	206		230		482
Available-for-sale Securities | Fair Value, Inputs, Level 1
Assets:
Securities	394	[2]	410	[2]	1,520	[2]
Available-for-sale Securities | Fair Value, Inputs, Level 1 | Equity Securities, Other
Assets:
Securities	188	[2]	180	[2]	1,038	[2]
US Treasury and Government | Fair Value, Inputs, Level 1 | Trading Securities
Assets:
Securities			1
Fair Value, Inputs, Level 1
Assets:
Derivative assets	6		90
Total assets	535		548		1,562
Liabilities:
Derivative liabilities	9		14		50
Short positions	6		1		6
Total liabilities	15		15		56
Fair Value, Inputs, Level 1 | Trading Securities
Assets:
Securities	135		48		42
Fair Value, Inputs, Level 1 | Trading Securities | Equity Securities, Other
Assets:
Securities	135		47		42
Fair Value, Inputs, Level 1 | Interest Rate Contract
Assets:
Derivative assets	6		90
Liabilities:
Derivative liabilities	9		14		50
Available-for-sale Securities | US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 2
Assets:
Securities	115		172		199
Available-for-sale Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Inputs, Level 2
Assets:
Securities	10,740		10,973		10,647
Available-for-sale Securities | Other Debt Securities | Fair Value, Inputs, Level 2
Assets:
Securities	1,146		1,342		959
Available-for-sale Securities | Fair Value, Inputs, Level 2
Assets:
Securities	14,267	[2]	14,136	[2]	13,607	[2]
Available-for-sale Securities | Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
Assets:
Securities	2,259		1,645		1,796
Available-for-sale Securities | Fair Value, Inputs, Level 2 | Equity Securities, Other
Assets:
Securities	7	[2]	4	[2]	6	[2]
US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 2 | Trading Securities
Assets:
Securities	37		20		35
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Inputs, Level 2 | Trading Securities
Assets:
Securities	33		8		9
Other Debt Securities | Fair Value, Inputs, Level 2 | Trading Securities
Assets:
Securities	11		115		159
Fair Value, Inputs, Level 2
Assets:
Residential mortgage loans held for sale	978		1,892		1,747
Derivative assets	1,843		1,890		2,222
Total assets	17,169		18,158		17,799
Liabilities:
Derivative liabilities	1,123		1,261		1,263
Short positions	6		1		1
Total liabilities	1,129		1,262		1,264
Fair Value, Inputs, Level 2 | Trading Securities
Assets:
Securities	81		240		223
Fair Value, Inputs, Level 2 | Trading Securities | Equity Securities, Other
Assets:
Securities			97		20
Fair Value, Inputs, Level 2 | Interest Rate Contract
Assets:
Derivative assets	1,463		1,448		1,834
Liabilities:
Derivative liabilities	762		846		909
Fair Value, Inputs, Level 2 | Foreign Exchange Contract
Assets:
Derivative assets	295		343		307
Liabilities:
Derivative liabilities	283		323		282
Fair Value, Inputs, Level 2 | Commodity Contract
Assets:
Derivative assets	85		99		81
Liabilities:
Derivative liabilities	78		92		72
US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 3 | Trading Securities
Assets:
Securities	1		1		1
Other Debt Securities | Fair Value, Inputs, Level 3 | Trading Securities
Assets:
Securities			5		4
Fair Value, Inputs, Level 3
Assets:
Residential mortgage loans	59	[1]	46	[1]	41	[1]
Derivative assets	115		94		109
Total assets	175		146		155
Liabilities:
Derivative liabilities	25		39		55
Total liabilities	25		39		55
Fair Value, Inputs, Level 3 | Trading Securities
Assets:
Securities	1		6		5
Fair Value, Inputs, Level 3 | Interest Rate Contract
Assets:
Derivative assets	9		13		25
Liabilities:
Derivative liabilities	4		11		1
Fair Value, Inputs, Level 3 | Equity Contract
Assets:
Derivative assets	106		81		84
Liabilities:
Derivative liabilities	21		28		54
Available-for-sale Securities
Assets:
Securities	14,661	[2]	14,546	[2]	15,127	[2]
Available-for-sale Securities | US Treasury and Government
Assets:
Securities	206		230		482
Available-for-sale Securities | US States and Political Subdivisions Debt Securities
Assets:
Securities	115		172		199
Available-for-sale Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Assets:
Securities	10,740		10,973		10,647
Available-for-sale Securities | Other Debt Securities
Assets:
Securities	1,146		1,342		959
Available-for-sale Securities | US Government Agencies Debt Securities
Assets:
Securities	2,259		1,645		1,796
Available-for-sale Securities | Equity Securities, Other
Assets:
Securities	195	[2]	184	[2]	1,044	[2]
US Treasury and Government | Trading Securities
Assets:
Securities			1
US States and Political Subdivisions Debt Securities | Trading Securities
Assets:
Securities	38		21		36
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Trading Securities
Assets:
Securities	33		8		9
Other Debt Securities | Trading Securities
Assets:
Securities	11		120		163
Trading Securities
Assets:
Securities	217		294		270
Trading Securities | Equity Securities, Other
Assets:
Securities	135		144		62
Interest Rate Contract
Assets:
Derivative assets	1,478		1,551		1,859
Liabilities:
Derivative liabilities	775		871		960
Foreign Exchange Contract
Assets:
Derivative assets	295		343		307
Liabilities:
Derivative liabilities	283		323		282
Equity Contract
Assets:
Derivative assets	106		81		84
Liabilities:
Derivative liabilities	21		28		54
Commodity Contract
Assets:
Derivative assets	85		99		81
Liabilities:
Derivative liabilities	$ 78		$ 92		$ 72

[1] Includes residential mortgage loans originated as held for sale and subsequently transferred to held for investment.

[2] Excludes FHLB and FRB restricted stock totaling $497 and $344, respectively, at June 30, 2011, $524 and $344 at December 31, 2010, and $551 and $343, respectively, at June 30, 2010.