Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES
Net income	$ 290	$ 277
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	20	29
Provision (benefit) for deferred income taxes	(13)	26
Depreciation and amortization	61	62
Net periodic defined benefit cost	19	44
Share-based compensation expense	22	18
Net amortization of securities	5	18
Accretion of loan purchase discount	(22)	(18)
Net securities (gains) losses	(1)	2
Net (gains) losses on foreclosed property	(2)	5
Excess tax benefits from share-based compensation arrangements	(6)	(2)
Net change in trading securities	5	4
Net change in accrued income receivable	(1)	(5)
Net change in accrued expenses payable	(60)	(35)
Other, net	29	(169)
Net cash provided by operating activities	346	256
INVESTING ACTIVITIES
Maturities and redemptions of investment securities available-for-sale	825	1,761
Purchases of investment securities available-for-sale	(940)	(1,355)
Net change in loans	(2,422)	563
Proceeds from sales of foreclosed property	9	29
Net increase in premises and equipment	(31)	(42)
Sales of Federal Home Loan Bank stock	41	41
Other, net	1	5
Net cash (used in) provided by investing activities	(2,517)	1,002
FINANCING ACTIVITIES
Net change in deposits	763	(636)
Net change in short-term borrowings	(77)	21
Maturities and redemptions of medium- and long-term debt	(1,256)	(1,055)
Issuances of medium- and long-term debt	349	0
Repurchases of common stock	(141)	(146)
Cash dividends paid on common stock	(65)	(61)
Issuances of common stock under employee stock plans	36	12
Excess tax benefits from share-based compensation arrangements	6	2
Other, net	(1)	(4)
Net cash used in financing activities	(386)	(1,867)
Net decrease in cash and cash equivalents	(2,557)	(609)
Cash and cash equivalents at beginning of period	6,451	4,534
Cash and cash equivalents at end of period	3,894	3,925
Interest paid	50	61
Income taxes and tax-related interest paid	110	22
Noncash investing and financing activities:
Loans transferred to other real estate	$ 11	$ 9