PARENT COMPANY ONLY FINANCIALS - Condensed Cash Flow Statements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income (loss)	$ 865us-gaap_NetIncomeLoss	$ (3,426)us-gaap_NetIncomeLoss	$ 643us-gaap_NetIncomeLoss
Deferred income taxes	141us-gaap_DeferredIncomeTaxExpenseBenefit	(53)us-gaap_DeferredIncomeTaxExpenseBenefit	306us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of assets	9us-gaap_GainLossOnDispositionOfAssets1	0us-gaap_GainLossOnDispositionOfAssets1	0us-gaap_GainLossOnDispositionOfAssets1
Net change in other liabilities	239	(398)	(169)
Net change in other assets	(295)	827	76
Net cash provided by operating activities	1,390	2,649	1,714
INVESTING ACTIVITIES
Net cash (used in) provided by investing activities	(10,274)	(2,453)	919
FINANCING ACTIVITIES
Repurchase of common stock	(334)	0	0
Dividends paid	(790)us-gaap_PaymentsOfDividends	(1,185)us-gaap_PaymentsOfDividends	(150)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	9,403	(502)	(3,264)
Increase (decrease) in cash and cash equivalents	519	(306)	(631)
Cash and cash equivalents at beginning of period	2,757	3,063	3,694
Cash and cash equivalents at end of period	3,276	2,757	3,063
RBS
OPERATING ACTIVITIES
Net income (loss)	865	(3,426)	643
Deferred income taxes	27	(11)	(12)
Gain on sale of assets	0	0	(1)
Equity in undistributed (earnings) losses of subsidiaries	(404)	3,594	(494)
Net change in other liabilities	18	7	47
Net change in other assets	(74)	15	(20)
Other operating, net	17	1	(2)
Total adjustments	(416)	3,606	(482)
Net cash provided by operating activities	449	180	161
INVESTING ACTIVITIES
Proceeds from sales and maturities of securities available for sale	0	0	3
Payments for investments in and advances to subsidiaries	(1,470)	(220)	(800)
Sale or repayment of investments in and advances to subsidiaries	945	315	1,164
Other investing, net	(11)	(1)	(1)
Net cash (used in) provided by investing activities	(536)	94	366
FINANCING ACTIVITIES
Proceeds from advances from subsidiaries	0	0	5
Repayment of advances from subsidiaries	0	(289)	(239)
Proceeds from issuance of long-term debt	1,000	1,000	350
Proceeds from issuance of common stock	13	0	0
Repurchase of common stock	(334)	0	0
Dividends paid	(806)	(1,185)	(150)
Net cash provided by (used in) financing activities	(127)	(474)	(34)
Increase (decrease) in cash and cash equivalents	(214)	(200)	493
Cash and cash equivalents at beginning of period	494	694	201
Cash and cash equivalents at end of period	$ 280	$ 494	$ 694

Proceeds from Sale or Repayment of Investments in and Advances to Subsidiaries and Affiliates, net

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