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Retirement benefits - Financial Assumptions (Details) - year | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
U.K. |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 2.40% | 2.60% | 3.70%
Retail Price Inflation | 3.10% | 3.20% | 3.00%
Salary inflation |  |  | 4.00%
Consumer Price Inflation | 2.10% | 2.20% | 2.00%
Pension increases | 1.70% | 1.80% | 1.70%
U.K. | Pre 6 April 1997 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Pension increases | 1.90% | 2.00% | 1.80%
U.K. | 1997 - 2005 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Pension increases | 2.10% | 2.20% | 2.10%
Non-U.K. |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 3.60% | 4.20% | 4.50%
Male | U.K. | Age 65 at accounting date |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy | 21.6 | 21.5 |
Male | U.K. | Aged 65 at 20 years after accounting date |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy | 23.3 | 23.2 |
Female | U.K. | Age 65 at accounting date |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy | 24.6 | 24.5 |
Female | U.K. | Aged 65 at 20 years after accounting date |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Life expectancy | 26.5 | 26.4 |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The life expectancy after retirement used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Actuarial Assumption Of Expected Rates Of Retail Price Inflation + References No definition available. + Details
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