CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
Net income	$ 223	$ 209
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	91	58
Originations of mortgage loans held for sale	(484)	(495)
Proceeds from sales of mortgage loans held for sale	479	462
Purchases of commercial loans held for sale	(362)	(288)
Proceeds from sales of commercial loans held for sale	345	262
Amortization of terminated cash flow hedges	15	4
Depreciation, amortization and accretion	112	113
Mortgage servicing rights valuation charge-off (recovery)	5	(1)
Securities impairment	1	1
Deferred income taxes	30	14
Share-based compensation	4	6
Gain on sales of:
Debt securities	(9)	(8)
Marketable equity securities available for sale	0	(2)
Premises and equipment	(2)	0
Increase in other assets	(339)	(136)
Increase (decrease) in other liabilities	265	(101)
Net cash provided by operating activities	374	98
INVESTING ACTIVITIES
Purchases of securities available for sale	(706)	(2,190)
Proceeds from maturities and paydowns of securities available for sale	709	865
Proceeds from sales of securities available for sale	217	1,101
Purchases of securities held to maturity	0	(181)
Proceeds from maturities and paydowns of securities held to maturity	131	150
Purchases of other investment securities, at fair value	(51)	0
Proceeds from sales of other investment securities, at fair value	53	0
Purchases of other investment securities, at cost	(37)	(6)
Proceeds from sales of other investment securities, at cost	4	11
Net increase in interest-bearing deposits in banks	(178)	(245)
Net increase in loans and leases	(2,401)	(1,183)
Net increase in bank-owned life insurance	(12)	(8)
Premises and equipment:
Purchases	(8)	(18)
Proceeds from sales	3	11
Capitalization of software	(45)	(47)
Net cash used in investing activities	(2,321)	(1,740)
FINANCING ACTIVITIES
Net increase in deposits	67	3,283
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase	(88)	145
Net increase in other short-term borrowed funds	670	0
Proceeds from issuance of long-term borrowed funds	750	0
Repayments of long-term borrowed funds (RBS balances of $125 and $0, respectively)	(629)	(3)
Dividends declared and paid to common stockholders	(53)	(55)
Net cash provided by financing activities	717	3,370
(Decrease) increase in cash and cash equivalents	(1,230)	1,728
Cash and cash equivalents at beginning of period	3,085	3,276
Cash and cash equivalents at end of period	$ 1,855	$ 5,004