CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net income	$ 619	$ 668
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	211	247
Originations of mortgage loans held for sale	(1,836)	(1,131)
Proceeds from sales of mortgage loans held for sale	1,780	1,089
Purchases of commercial loans held for sale	(887)	0
Proceeds from sales of commercial loans held for sale	826	0
Amortization of terminated cash flow hedges (related party balances of $13 and $13, respectively)	13	36
Depreciation, amortization and accretion	350	313
Mortgage servicing rights valuation recovery	(6)	(8)
Securities impairment	5	7
Deferred income taxes	76	31
Share-based compensation	22	29
Loss on disposal/impairment of premises and equipment	0	18
Loss on sale of other branch assets held for sale	0	9
Gain on sales of:
Debt securities	(19)	(27)
Marketable equity securities available for sale	(3)	0
Premises and equipment	(9)	0
Other loans held for sale	0	(11)
Deposits held for sale	0	(286)
Increase in other assets (related party balances of ($99) and $53, respectively)	(306)	(2,033)
(Decrease) increase in other liabilities (related party balances of ($112) and ($151), respectively)	(5)	2,256
Net cash provided by operating activities	831	1,207
INVESTING ACTIVITIES
Purchases of securities available for sale	(5,418)	(5,642)
Proceeds from maturities and paydowns of securities available for sale	2,660	2,238
Proceeds from sales of securities available for sale	3,180	1,265
Purchases of securities held to maturity	(811)	(1,174)
Proceeds from maturities and paydowns of securities held to maturity	610	216
Proceeds from sales of securities held to maturity	73	0
Purchases of other investment securities, at fair value	(109)	(97)
Proceeds from sales of other investment securities, at fair value	92	90
Purchases of other investment securities, at cost	(33)	(72)
Proceeds from sales of other investment securities, at cost	78	114
Net decrease (increase) in interest-bearing deposits in banks	7	(59)
Net increase in loans and leases	(4,315)	(4,120)
Net increase in bank-owned life insurance	(26)	(31)
Premises and equipment:
Purchases	(54)	(48)
Proceeds from sales	12	29
Capitalization of software	(142)	(116)
Net cash used in investing activities	(4,196)	(7,407)
FINANCING ACTIVITIES
Net increase in deposits	6,159	1,569
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase	(2,983)	393
Net (decrease) increase in other short-term borrowed funds	(1,152)	4,462
Proceeds from issuance of long-term borrowed funds (related party balances of $0 and $666, respectively)	250	666
Repayments of long-term borrowed funds	(8)	(7)
Treasury stock purchased	(500)	0
Net proceeds from issuance of preferred stock	247	0
Dividends declared and paid to common stockholders	(90)	0
Dividends declared and paid to RBS	(71)	(751)
Dividends declared and paid to preferred stockholders	(7)	0
Net cash provided by financing activities	1,845	6,332
(Decrease) increase in cash and cash equivalents	(1,520)	132
Cash and cash equivalents at beginning of period	3,276	2,757
Cash and cash equivalents at end of period	$ 1,756	$ 2,889