Reconciliation of the Beginning and Ending Balances for Fair Valued Assets and Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Trading Account Assets
Beginning balance	$ 62		$ 425		$ 209		$ 390
Included in earnings	(5)	[1]	15	[2]	49	[1]	45	[2]
OCI	0		(125)		0		(4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	6				6
Sales	0				(57)
Purchases, sales, issuances, settlements, maturities paydowns, net			0				(116)
Settlements	(8)				(132)
Transfers to/from other balance sheet line items	0		(14)		(20)		(14)
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	55		301		55		301
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	(5)	[1]	11	[2]	14	[1]	21	[3]
Trading Account Assets | Collateralized Debt Obligations
Beginning balance	42		117		53		175
Included in earnings	(6)	[4]	13		25	[4]	30
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	6				6
Sales	0				(21)
Purchases, sales, issuances, settlements, maturities paydowns, net			(7)				(82)
Settlements	0				(1)
Transfers to/from other balance sheet line items	0		0		(20)		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	42		123		42		123
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	(6)		12		11		24
Trading Account Assets | US States and Political Subdivisions Debt Securities
Beginning balance			9				7
Included in earnings			0				0
OCI			0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			0				2
Transfers to/from other balance sheet line items			0				0
Transfers into Level 3			0				0
Transfers out of Level 3			0				0
Fair value, ending balance			9				9
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period			0				(1)
Trading Account Assets | Mortgage-backed Securities, Issued by Private Enterprises
Beginning balance	2		3		6		6
Included in earnings	0		1		2		0
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				(5)
Purchases, sales, issuances, settlements, maturities paydowns, net			(1)				(3)
Settlements	(1)				(2)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	1		3		1		3
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		0		(1)
Trading Account Assets | Asset-backed Securities
Beginning balance	5		48		27		51
Included in earnings	0		(1)		9		2
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				(31)
Purchases, sales, issuances, settlements, maturities paydowns, net			8				2
Settlements	0				0
Transfers to/from other balance sheet line items	0		(14)		0		(14)
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	5		41		5		41
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		(1)		2		(1)
Trading Account Assets | Equity Securities
Beginning balance	13		120		123		151
Included in earnings	1		0		13		4
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			0				(35)
Settlements	(7)				(129)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	7		120		7		120
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	1		0		1		0
Trading Account Assets | Derivative Financial Instruments, Assets
Beginning balance			128				0
Included in earnings			2				9
OCI			(125)	[5]			(4)	[5]
Purchases, sales, issuances, settlements, maturities paydowns, net			0				0
Transfers to/from other balance sheet line items			0				0
Transfers into Level 3			0				0
Transfers out of Level 3			0				0
Fair value, ending balance			5				5
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period			0				0
Available-for-Sale Securities
Beginning balance	1,000		1,308		1,136		1,322
Included in earnings	1	[6]	1	[6]	(1)	[6]	0	[6]
OCI	(11)		22		0		47
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	(4)				(4)
Purchases, sales, issuances, settlements, maturities paydowns, net			(32)				(70)
Settlements	(53)				(198)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	933		1,299		933		1,299
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0	[6]	0		(3)	[6]	(2)	[6]
Available-for-Sale Securities | US States and Political Subdivisions Debt Securities
Beginning balance	68		125		74		132
Included in earnings	1		1		2		1
OCI	0		1		1		(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	(4)				(4)
Purchases, sales, issuances, settlements, maturities paydowns, net			(6)				(11)
Settlements	(3)				(11)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	62		121		62		121
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		0		0
Available-for-Sale Securities | Mortgage-backed Securities, Issued by Private Enterprises
Beginning balance	311		365		347		378
Included in earnings	0		0		(3)		(2)
OCI	(9)		19		0		53
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			(20)				(65)
Settlements	(15)				(57)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	287		364		287		364
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		(3)		(2)
Available-for-Sale Securities | Asset-backed Securities
Beginning balance	19		108		20		102
Included in earnings	0		0		0		1	[4]
OCI	(2)		2		(1)		(5)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			18				30
Settlements	(1)				(3)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	16		128		16		128
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		0		0
Available-for-Sale Securities | Corporate And Other Debt Securities
Beginning balance	5		5		5		5
Included in earnings	0		0		0		0
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			0				0
Settlements	0				0
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	5		5		5		5
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		0		0
Available-for-Sale Securities | Equity Securities, Other
Beginning balance	597		705		690		705
Included in earnings	0		0		0		0
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			(24)				(24)
Settlements	(34)				(127)
Transfers to/from other balance sheet line items	0		0		0		0
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	563		681		563		681
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		0		0
Loans Held-for-Sale
Beginning balance	3
Included in earnings	0
OCI	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	(1)
Settlements	0
Transfers to/from other balance sheet line items	(3)
Transfers into Level 3	3
Transfers out of Level 3	0
Fair value, ending balance	2				2
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0
Loans Held-for-Sale | Corporate and Other Loans
Beginning balance			5		5		9
Included in earnings			0		(1)	[7]	(2)	[7]
OCI			0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases					0
Sales					0
Purchases, sales, issuances, settlements, maturities paydowns, net			0				(2)
Settlements					0
Transfers to/from other balance sheet line items			0		(4)		0
Transfers into Level 3			0		0		0
Transfers out of Level 3			0		0		0
Fair value, ending balance	0		5		0		5
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period			0		0		(2)	[7]
Loans Held-for-Sale | Residential Mortgage, Loans Held For Sale
Beginning balance			104		2		142
Included in earnings			(4)	[8]	(1)	[8]	1	[8]
OCI			0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases					0
Sales					(15)
Purchases, sales, issuances, settlements, maturities paydowns, net			(10)				(80)
Settlements					(1)
Transfers to/from other balance sheet line items			(71)		0		(67)
Transfers into Level 3			42		19		66
Transfers out of Level 3			(2)		(2)		(3)
Fair value, ending balance	2		59		2		59
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period			(5)	[8]	0		(10)	[8]
Loans Held-for-Investment
Beginning balance	449		411		492		449
Included in earnings	16		5	[9]	16		10	[9]
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			(10)				(35)
Settlements	(12)				(46)
Transfers to/from other balance sheet line items	(1)		68		(10)		51
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		(2)		0		(3)
Fair value, ending balance	452		472		452		472
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	14	[9]	3	[9]	13	[9]	9	[9]
Other Assets and Liabilities, Net
Beginning balance	12		53		(24)		(35)
Included in earnings	145		164	[8]	229		376	[8]
OCI	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net			0				6
Settlements	1				7
Transfers to/from other balance sheet line items	(95)		(137)		(149)		(267)
Transfers into Level 3	0		0		0		0
Transfers out of Level 3	0		0		0		0
Fair value, ending balance	63		80		63		80
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0		0		0
Derivative Financial Instruments, Liabilities
Beginning balance	(154)				(145)		(46)
Included in earnings	0				1		0
OCI	8	[10]			(2)	[10]	46	[5]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0				0
Sales	0				0
Purchases, sales, issuances, settlements, maturities paydowns, net							0
Settlements	0				0
Transfers to/from other balance sheet line items	0				0		0
Transfers into Level 3							0
Transfers out of Level 3							0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Transfers Into Level 3	0				0
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liabilities Transfers Out Of Level 3	0				0
Fair value, ending balance	(146)		0		(146)		0
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	$ 0				$ 1		$ 0

[1] Amounts included in earnings are recorded in trading account profits and commissions.

[2] Amounts included in earnings are recorded in trading account profits/(losses) and commissions.

[3] Change in unrealized gains/(losses) included in earnings for the period related to financial assets still held at September 30, 2010.

[4] Amounts included in earnings do not include losses accrued as a result of the ARS settlements discussed in Note 14, "Contingencies."

[5] Amount recorded in OCI is the effective portion of the cash flow hedges related to the Company’s probable forecasted sale of its shares of Coke stock as discussed in Note 11, “Derivative Financial Instruments.”

[6] Amounts included in earnings are recorded in net securities gains.

[7] Amounts included in earnings are recorded in other noninterest income.

[8] Amounts included in earnings are net of issuances, fair value changes, and expirations and are recorded in mortgage production related income.

[9] Amounts are generally included in mortgage production related income, however, the mark on certain fair value loans is included in trading account profits and commissions.

[10] Amount recorded in OCI is the effective portion of the cash flow hedges related to the Company’s probable forecasted sale of its shares of Coke common stock as discussed in Note 11, “Derivative Financial Instruments.”