The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of residual interest in the assets of the entity after deducting all its liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 1
-IssueDate 2017-01-01
-Paragraph 24
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2017-03-01&anchor=para_24_a&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 1
-IssueDate 2017-01-01
-Paragraph 32
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2017-03-01&anchor=para_32_a_i&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_a&doctype=Standard
-URIDate 2017-03-09

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_b&doctype=Standard
-URIDate 2017-03-09

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e&doctype=Standard
-URIDate 2017-03-09

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_Equity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The common equity tier 1 ratio.

+ References

No definition available.

+ Details

Name:	rbs_CommonEquityTier1Ratio
Namespace Prefix:	rbs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The per share redemption price.

+ References

No definition available.

+ Details

Name:	rbs_RedemptionPricePerShare
Namespace Prefix:	rbs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_AdditionalPaidinCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_AdditionalTier1NotesCallableAugust2020UsdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_AdditionalTier1NotesCallableAugust2025UsdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_AdditionalTier1NotesCallableAugust2021UsdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_EuroMediumTermNoteRedeemedOctober2017UsdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_EuroMediumTermNoteRedeemedOctober2017CadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_SubordinatedNotesRedeemedJune2017PoundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rbs_AdditionalTier1NotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Other Equity (Details) £ / shares in Units, $ / shares in Units, £ in Millions, $ in Millions, $ in Millions	Dec. 31, 2017 CAD ($)	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2017 GBP (£) £ / shares	Dec. 31, 2016 CAD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 GBP (£)	Dec. 31, 2015 GBP (£)	Dec. 31, 2014 GBP (£)
Borrowings
Equity			£ 49,093			£ 49,404	£ 54,147
Paid-in equity
Borrowings
Equity			4,058			4,582	£ 2,646	£ 784
Paid-in equity \| Additional tier 1 note callable August, 2020, USD
Borrowings
Equity			£ 1,278			£ 1,278
Notional amount \| $		$ 2,000			$ 2,000
Interest rate	7.50%	7.50%	7.50%	7.50%	7.50%	7.50%
Conversion rate \| $ / shares		$ 3.606
Par value \| £ / shares			£ 1
Paid-in equity \| Additional tier 1 note callable August, 2025, USD
Borrowings
Equity			£ 734			£ 734
Notional amount \| $		$ 1,150			$ 1,150
Interest rate	8.00%	8.00%	8.00%	8.00%	8.00%	8.00%
Conversion rate \| $ / shares		$ 3.606
Par value \| £ / shares			£ 1
Paid-in equity \| Additional tier 1 note callable August, 2021, USD
Borrowings
Equity			£ 2,046			£ 2,046
Notional amount \| $		$ 2,650			$ 2,650
Interest rate	8.625%	8.625%	8.625%	8.625%	8.625%	8.625%
Conversion rate \| $ / shares		$ 2.284
Par value \| £ / shares			£ 1
Paid-in equity \| EMTN note redeemed October, 2017, USD
Borrowings
Equity						£ 275
Notional amount \| $		$ 564			$ 564
Interest rate	6.99%	6.99%	6.99%	6.99%	6.99%	6.99%
Paid-in equity \| EMTN note redeemed October, 2017, CAD
Borrowings
Equity						£ 156
Notional amount \| $	$ 321			$ 321
Interest rate	6.666%	6.666%	6.666%	6.666%	6.666%	6.666%
Paid-in equity \| Subordinated note redeemed June, 2017, Pound
Borrowings
Equity						£ 93
Notional amount			£ 93			£ 93
Interest rate	5.6457%	5.6457%	5.6457%	5.6457%	5.6457%	5.6457%
Paid-in equity \| Maximum \| Additional Tier 1 notes
Borrowings
CET1 ratio (as a percent)	7.00%	7.00%	7.00%