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Retirement benefits - Defined Benefit Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined benefit obligation |  |  |
Statement [Line Items] |  |  |
At 1 January | $ 103 | $ 96 | $ 91
Interest expense/(income) | 2 | 3 | 3
Total | 2 | 3 | 3
Demographic assumptions | (3) | (3) | (1)
Financial assumptions | (3) | 10 | 9
Experience adjustments | (1) | 1 | (1)
Re-measurement loss/(gain) | (7) | 8 | 7
Exchange adjustments | (1) | 2 | 1
Total | (8) | 10 | 8
Group contributions | 0 |  |
Benefits paid | (5) | (6) | (6)
Total | (5) | (6) | (6)
At 31 December | 92 | 103 | 96
Defined benefit obligation | United Kingdom [member] | Unfunded Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded Plans | 30 | 31 | 26
Defined benefit obligation | United States [member] | Unfunded Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded Plans | 45 | 50 | 48
Defined benefit obligation | United States [member] | Unfunded Plans [member] | Post-retirement Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded post-employment plans | 17 | 22 | 22
Fair value of plan assets |  |  |
Statement [Line Items] |  |  |
At 1 January | 0 |  |
Interest expense/(income) | 0 |  |
Total | 0 |  |
Demographic assumptions | 0 |  |
Financial assumptions | 0 |  |
Experience adjustments | 0 |  |
Re-measurement loss/(gain) | 0 |  |
Exchange adjustments | 0 |  |
Total | 0 |  |
Group contributions | (5) | (6) | (6)
Benefits paid | 5 | 6 | 6
Total | 0 |  |
At 31 December | 0 | 0 |
Fair value of plan assets | United Kingdom [member] | Unfunded Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded Plans | 0 |  |
Fair value of plan assets | United States [member] | Unfunded Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded Plans | 0 |  |
Fair value of plan assets | United States [member] | Unfunded Plans [member] | Post-retirement Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded post-employment plans | 0 |  |
Net defined benefit liability (asset) [member] |  |  |
Statement [Line Items] |  |  |
At 1 January | 103 | 96 | 91
Interest expense/(income) | 2 | 3 | 3
Total | 2 | 3 | 3
Demographic assumptions | (3) | (3) | (1)
Financial assumptions | (3) | 10 | 9
Experience adjustments | (1) | 1 | (1)
Re-measurement loss/(gain) | (7) | 8 | 7
Exchange adjustments | (1) | 2 | 1
Total | (8) | 10 | 8
Group contributions | (5) | (6) | (6)
Benefits paid | 0 |  |
Total | (5) | (6) | (6)
At 31 December | 92 | 103 | 96
Net defined benefit liability (asset) [member] | United Kingdom [member] | Unfunded Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded Plans | 30 | 31 | 26
Net defined benefit liability (asset) [member] | United States [member] | Unfunded Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded Plans | 45 | 50 | 48
Net defined benefit liability (asset) [member] | United States [member] | Unfunded Plans [member] | Post-retirement Plans [member] |  |  |
Statement [Line Items] |  |  |
Unfunded post-employment plans | $ 17 | $ 22 | $ 22

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_f&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_g&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Value of benefit obligations relating to unfunded plans. + References No definition available. + Details
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- Definition Defined benefit obligation value of unfunded post employment plans. + References No definition available. + Details
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- Definition Gain loss on remeasurement before exchange of net defined benefit liability ​asset. + References No definition available. + Details
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