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, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Derivative Financial Instruments, Liabilities [Member]
Beginning balance	$ (189)		$ (145)
Included in earnings	1	[1]	0	[1]
OCI	(58)	[2]	(16)	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0
Sales	0		0
Settlements	0		0
Transfers to other balance sheet line items	0		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	(246)		(161)
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	1	[1],[3]	0
Trading Account Assets
Beginning balance	49		209
Included in earnings	0		50	[1]
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		(57)
Settlements	0		(77)
Transfers to other balance sheet line items	0		20
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	49		105
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		22	[1],[4]
Trading Account Assets | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Beginning balance	1		6
Included in earnings	0		2
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		(5)
Settlements	0		(1)
Transfers to other balance sheet line items	0		0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	1		2
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0
Trading Account Assets | Collateralized Debt Obligations [Member]
Beginning balance	43		53
Included in earnings	0		31	[5]
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		(21)
Settlements	0		(1)
Transfers to other balance sheet line items	0		20
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	43		42
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		18	[4],[5]
Trading Account Assets | Asset-backed Securities [Member]
Beginning balance	5		27
Included in earnings	0		9
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		(31)
Settlements	0		0
Transfers to 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		2	[4]
Trading Account Assets | Equity Securities
Beginning balance			123
Included in earnings			8
OCI			0
Sales			0
Settlements			(75)
Transfers to other balance sheet line items			0
Transfers into Level 3			0
Transfers out of Level 3			0
Fair value, ending balance			56
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period			2	[4]
Available-for-sale Securities [Member]
Beginning balance	1,041		1,136
Included in earnings	(2)	[6]	(1)	[6]
OCI	9		20
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	90
Sales	0		0
Settlements	(12)		(29)
Transfers to other balance sheet line items	0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	1,126		1,126
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	(2)	[3],[6]	(1)	[4],[6]
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
Beginning balance	58		74
Included in earnings	0		0
OCI	(1)		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		0
Settlements	0		(1)
Transfers to other balance sheet line items	0		0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	57		73
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 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Beginning balance	221		347
Included in earnings	(2)		(1)
OCI	9		18
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		0
Settlements	(12)		(26)
Transfers to other balance sheet line items	0		0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	216		338
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	(2)	[3]	(1)	[4]
Available-for-sale Securities [Member] | Asset-backed Securities [Member]
Beginning balance	16		20
Included in earnings	0		0
OCI	1		2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		0
Settlements	0		(2)
Transfers to other balance sheet line items	0		0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	17		20
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 [Member] | Corporate And Other Debt Securities [Member]
Beginning balance	5		5
Included in earnings	0		0
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		0
Settlements	0		0
Transfers to 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 [Member] | Equity Securities, Other [Member]
Beginning balance	741		690
Included in earnings	0		0
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	90
Sales	0		0
Settlements	0		0
Transfers to other balance sheet line items	0		0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	831		690
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	0		0
Loans Held-for-Sale | Corporate and Other Loans
Beginning balance			5
Included in earnings			(1)	[7]
OCI			0
Sales			0
Settlements			0
Transfers to other balance sheet line items			4
Transfers into Level 3			0
Transfers out of Level 3			0
Fair value, ending balance			0
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 | Residential Mortgage, Loans Held For Sale [Member]
Beginning balance	1		2
Included in earnings	0		(1)	[8]
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		(2)
Settlements	0		(1)
Transfers to other balance sheet line items	(4)		(9)
Transfers into Level 3	3		11
Transfers out of Level 3	(4)		(1)
Fair value, ending balance	4		17
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	(2)	[3],[8]	(3)	[4],[8]
Loans Held For Investment [Member]
Beginning balance	433		492
Included in earnings	(4)	[9]	(1)	[10]
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		0
Settlements	(12)		(23)
Transfers to other balance sheet line items	6		11
Transfers into Level 3	2		0
Transfers out of Level 3	0		0
Fair value, ending balance	413		457
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	(2)	[3],[9]	(2)	[10],[4]
Other Assets And Liabilities, Net [Member]
Beginning balance	62		(24)
Included in earnings	179	[8]	36	[8]
OCI	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0
Sales	0		0
Settlements	22		0
Transfers to other balance sheet line items	172		14
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Fair value, ending balance	91		(2)
Change in unrealized gains / (losses) included in earnings for the period related to financial assets still held at the end of period	$ 0		$ 36	[4],[8]

[1] Amounts included in earnings are recorded in trading income.

[2] 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 10, “Derivative Financial Instruments.”

[3] Change in unrealized gains/(losses) included in earnings during the period related to financial assets still held at March 31, 2012

[4] Change in unrealized gains/(losses) included in earnings for the period related to financial assets still held at March 31, 2011.

[5] Amounts included in earnings do not include losses accrued as a result of the ARS settlements discussed in Note 13, "Contingencies."

[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/(loss).

[9] Amounts are generally included in mortgage production related income/(loss); however, the mark on certain fair value loans is included in trading income.

[10] Amounts are generally included in mortgage production related income/(loss), however, the mark on certain fair value loans is included in trading income.