Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities:
Net income	$ 2,061	$ 1,920	$ 1,556
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense	225	218	1,244
Amortization of other intangible assets	198	200	179
Other non-cash adjustments for depreciation, amortization and accretion	258	180	(409)
(Gains) Losses related to investment securities, net	(23)	(67)	286
Change in trading account assets, net	70	(183)	(331)
Change in accrued income receivable	(148)	(89)	(236)
Change in collateral deposits, net	(1,443)	817	(2,786)
Change in unrealized losses (gains) on foreign exchange derivatives, net	982	(622)	338
Change in other assets, net	(360)	1,269	386
Change in trading liabilities, net	0	(441)	555
Change in accrued expenses and other liabilities, net	(250)	(147)	61
Other, net	256	319	(20)
Net cash provided by operating activities	1,826	3,374	823
Investing Activities:
Net decrease (increase) in interest-bearing deposits with banks	8,123	(36,652)	4,398
Net decrease (increase) in securities purchased under resale agreements	2,029	(4,117)	(541)
Proceeds from sales of available-for-sale securities	5,399	16,272	24,736
Proceeds from maturities of available-for-sale securities	44,375	44,810	34,250
Purchases of available-for-sale securities	(60,812)	(78,748)	(65,485)
Proceeds from maturities of held-to-maturity securities	3,176	3,653	5,249
Proceeds from sales of held-to-maturity securities	0	0	4,676
Purchases of held-to-maturity securities	(3,577)	(457)	(426)
Net (increase) decrease in loans	(2,303)	1,638	(1,320)
Business acquisitions, net of cash acquired	(511)	(214)	(2,332)
Purchases of equity investments and other long-term assets	(251)	(69)	(114)
Purchases of premises and equipment	(355)	(298)	(262)
Other, net	116	287	363
Net cash provided by (used in) investing activities	(4,591)	(53,895)	3,192
Financing Activities:
Net increase (decrease) in time deposits	7,627	(124)	857
Net (decrease) increase in all other deposits	(733)	59,066	7,426
Net decrease in short-term borrowings	(1,587)	(8,555)	(11,233)
Proceeds from issuance of long-term debt, net of issuance costs	998	1,986	0
Payments for long-term debt and obligations under capital leases	(1,781)	(2,486)	(341)
Proceeds from issuance of preferred stock	488	500	0
Proceeds related to common stock awards and option exercises	154	49	10
Purchases of common stock	(1,440)	(675)	0
Repurchases of common stock for employee tax withholding	(101)	(63)	(44)
Payments for cash dividends	(463)	(295)	(20)
Net cash provided by (used in) financing activities	3,162	49,403	(3,345)
Net increase (decrease)	397	(1,118)	670
Cash and due from banks at beginning of year	2,193	3,311	2,641
Cash and due from banks at end of year	2,590	2,193	3,311
Supplemental disclosure:
Interest paid	516	611	763
Income taxes (refunded) paid, net	$ (186)	$ 305	$ (11)