CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net income	$ 399,000,000	$ 479,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	135,000,000	170,000,000
Originations of mortgage loans held for sale	(1,182,000,000)	(684,000,000)
Proceeds from sales of mortgage loans held for sale	1,111,000,000	688,000,000
Purchases of commercial loans held for sale	(632,000,000)	0
Proceeds from sales of commercial loans held for sale	594,000,000	0
Amortization of terminated cash flow hedges (related party balances of $9 and $12, respectively)	9,000,000	24,000,000
Depreciation, amortization and accretion	234,000,000	196,000,000
Mortgage servicing rights valuation recovery	(7,000,000)	(3,000,000)
Securities impairment	3,000,000	6,000,000
Deferred income taxes	56,000,000	36,000,000
Share-based compensation	15,000,000	19,000,000
Loss on disposal/impairment of premises and equipment	0	11,000,000
Loss on sale of other branch assets held for sale	0	9,000,000
Gain on sales of:
Debt securities available for sale	(17,000,000)	(25,000,000)
Marketable equity securities available for sale	(3,000,000)	0
Other loans held for sale	0	(11,000,000)
Deposits held for sale	0	(286,000,000)
(Increase) decrease in other assets (related party balances of ($34) and $47, respectively)	(138,000,000)	57,000,000
(Decrease) increase in other liabilities (related party balances of ($88) and ($147), respectively)	(62,000,000)	335,000,000
Net cash provided by operating activities	515,000,000	1,021,000,000
INVESTING ACTIVITIES
Purchases of securities available for sale	(4,089,000,000)	(4,318,000,000)
Proceeds from maturities and paydowns of securities available for sale	1,804,000,000	1,421,000,000
Proceeds from sales of securities available for sale	1,251,000,000	711,000,000
Purchases of other investment securities	(14,000,000)	(68,000,000)
Proceeds from sales of other investment securities	20,000,000	55,000,000
Purchases of securities held to maturity	(811,000,000)	(1,174,000,000)
Proceeds from maturities and paydowns of securities held to maturity	394,000,000	120,000,000
Net decrease (increase) in interest-bearing deposits in banks	184,000,000	(76,000,000)
Net increase in loans and leases	(3,573,000,000)	(2,171,000,000)
Net increase in bank-owned life insurance	(16,000,000)	(22,000,000)
Premises and equipment:
Purchases	(43,000,000)	(37,000,000)
Proceeds from sales	15,000,000	29,000,000
Capitalization of software	(92,000,000)	(80,000,000)
Net cash used in investing activities	(4,970,000,000)	(5,610,000,000)
FINANCING ACTIVITIES
Net increase (decrease) in deposits	4,908,000,000	(238,000,000)
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase	(492,000,000)	2,016,000,000
Net (decrease) increase in other short-term borrowed funds	(251,000,000)	5,450,000,000
Proceeds from issuance of long-term borrowed funds (related party balances of $0 and $333, respectively)	0	333,000,000
Repayments of long-term borrowed funds	(6,000,000)	(5,000,000)
Treasury stock purchased	(250,000,000)	0
Net proceeds from issuance of preferred stock	247,000,000	0
Dividends declared and paid to common stockholders	(48,000,000)	0
Dividends declared and paid to RBS	(60,000,000)	(368,000,000)
Net cash provided by financing activities	4,048,000,000	7,188,000,000
(Decrease) increase in cash and cash equivalents	(407,000,000)	2,599,000,000
Cash and cash equivalents at beginning of period	3,276,000,000	2,757,000,000
Cash and cash equivalents at end of period	$ 2,869,000,000	$ 5,356,000,000