Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities:
Net income	$ 917	$ 984
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax benefit	(55)	(15)
Amortization of other intangible assets	99	99
Other non-cash adjustments for depreciation, amortization and accretion	165	70
(Gains) Losses related to investment securities, net	16	(20)
Change in trading account assets, net	101	(1,477)
Change in accrued income receivable	(92)	(138)
Change in collateral deposits, net	(2,998)	(683)
Change in unrealized (gains) losses on foreign exchange derivatives, net	348	(379)
Change in other assets, net	913	(4,363)
Change in trading liabilities, net	5	748
Change in accrued expenses and other liabilities, net	(1,136)	3,395
Other, net	268	(282)
Net cash (used in) provided by operating activities	(1,449)	(2,061)
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	27,741	(8,665)
Net (increase) decrease in securities purchased under resale agreements	(1,099)	1,005
Proceeds from sales of available-for-sale securities	2,451	7,552
Proceeds from maturities of available-for-sale securities	21,653	21,380
Purchases of available-for-sale securities	(28,698)	(40,870)
Proceeds from maturities of held-to-maturity securities	1,512	1,940
Purchases of held-to-maturity securities	(5)	(452)
Net increase in loans	(2,338)	(1,154)
Business acquisitions, net of cash acquired	0	(77)
Purchases of equity investments and other long-term assets	(53)	(63)
Purchases of premises and equipment	(143)	(192)
Other, net	69	194
Net cash (used in) provided by investing activities	21,090	(19,402)
Financing Activities:
Net increase (decrease) in time deposits	3,000	(6,261)
Net increase (decrease) in all other deposits	(16,516)	33,325
Net increase (decrease) in short-term borrowings	284	(5,459)
Proceeds from issuance of long-term debt, net of issuance costs	0	1,986
Payments for long-term debt and obligations under capital leases	(1,762)	(1,018)
Proceeds from issuance of preferred stock	0	500
Proceeds from exercises of common stock options	16	37
Purchases of common stock	(480)	(225)
Repurchases of common stock for employee tax withholding	(69)	(58)
Payments for cash dividends	(219)	(103)
Net cash (used in) provided by financing activities	(15,746)	22,724
Net decrease	3,895	1,261
Cash and due from banks at beginning of year	2,193	3,311
Cash and due from banks at end of year	$ 6,088	$ 4,572