CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income (loss)	$ 840	$ 865	$ (3,426)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for credit losses	302	319	479
Originations of mortgage loans held for sale	(2,363)	(1,615)	(3,781)
Proceeds from sales of mortgage loans held for sale	2,381	1,578	4,229
Purchases of commercial loans held for sale	(1,176)	(312)	0
Proceeds from sales of commercial loans held for sale	1,158	269	0
Amortization of terminated cash flow hedges (related party balances of $17, $45 and $69, respectively)	17	46	73
Depreciation, amortization and accretion	471	386	404
Mortgage servicing rights valuation recovery	(9)	(5)	(47)
Securities impairment	7	10	8
Goodwill impairment	0	0	4,435
Deferred income taxes	249	141	(53)
Share-based compensation	24	53	27
Loss on disposal/impairment of premises and equipment	0	27	16
Loss on sale of other branch assets held for sale	0	9	0
Gain on sales of:
Debt securities	(29)	(28)	(144)
Marketable equity securities available for sale	(3)	0	0
Premises and equipment	(9)	0	0
Extinguishment of debt	(3)	0	0
Other loans held for sale	0	(11)	0
Deposits held for sale	0	(286)	0
(Increase) decrease in other assets (related party balances of ($51), $55 and ($35), respectively)	(467)	(295)	827
(Decrease) increase in other liabilities (related party balances of ($190), ($445) and ($452), respectively)	(161)	239	(398)
Net cash provided by operating activities	1,229	1,390	2,649
INVESTING ACTIVITIES
Purchases of securities available for sale	(6,783)	(8,315)	(10,999)
Proceeds from maturities and paydowns of securities available for sale	3,420	2,999	4,708
Proceeds from sales of securities available for sale	3,916	3,325	3,645
Purchases of securities held to maturity	(932)	(1,174)	(224)
Proceeds from maturities and paydowns of securities held to maturity	761	362	22
Proceeds from sales of securities held to maturity	72	0	0
Purchases of other investment securities, at fair value	(157)	0	0
Proceeds from sales of other investment securities, at fair value	120	0	0
Purchases of other investment securities, at cost	(91)	(84)	(1)
Proceeds from sales of other investment securities, at cost	95	146	127
Net decrease (increase) in interest-bearing deposits in banks	14	(137)	993
Net increase in loans and leases (related party balances of $0, ($413) and $0, respectively)	(6,019)	(6,900)	(341)
Net increase in bank-owned life insurance	(37)	(188)	(40)
Premises and equipment:
Purchases	(121)	(141)	(160)
Proceeds from sales	15	3	25
Capitalization of software	(178)	(170)	(208)
Net cash used in investing activities	(5,905)	(10,274)	(2,453)
FINANCING ACTIVITIES
Net increase (decrease) in deposits	6,832	3,813	(2,968)
Net (decrease) increase in federal funds purchased and securities sold under agreements to repurchase	(3,474)	(515)	1,190
Net (decrease) increase in other short-term borrowed funds	(4,383)	4,002	1,750
Proceeds from issuance of long-term borrowed funds (related party balances of $0, $1,000 and $1,000, respectively)	6,750	3,249	1,002
Repayments of long-term borrowed funds (related party balances of $750, $0 and $280, respectively)	(766)	(6)	(291)
Treasury stock purchased	(500)	(334)	0
Net proceeds from issuance of preferred stock	247	0	0
Dividends declared and paid to RBS	(71)	(790)	(1,185)
Dividends declared and paid to other common stockholders	(143)	(16)	0
Dividends declared and paid to preferred stockholders	(7)	0	0
Net cash provided by (used in) financing activities	4,485	9,403	(502)
(Decrease) increase in cash and cash equivalents	(191)	519	(306)
Cash and cash equivalents at beginning of period	3,276	2,757	3,063
Cash and cash equivalents at end of period	3,085	3,276	2,757
Supplemental disclosures:
Interest paid	454	338	452
Income taxes paid	157	391	20
Non-cash items:
Transfer of securities from available for sale to held to maturity	0	0	4,240
Transfer of loans and leases to other loans held for sale	0	0	1,078
Loans securitized and transferred to securities available for sale	3	18	106
Income tax withholding on stock purchased for share based compensation	22	2	0
Stock purchased for share-based compensation plans	40	71	0
Capital contribution	0	0	14
Employee stock purchase plan shares purchased	9	2	0
Due from broker for securities sold but not settled	$ 0	$ 0	$ (442)