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Equity-based compensation - Additional information (Details) shares in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) shares metric | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Apr. 08, 2019 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Equity-based compensation expense | $ 113 | $ 114 | $ 93 |
Accrued share-based payments | $ 9 | $ 10 |  |
Number of awards outstanding (in shares) | shares | 5,417 | 4,742 |  | 4,222
Remaining weighted-average vesting period | 1 year 3 months 18 days |  |  |
Chief executive officer [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Percent paid in cash |  | 50.00% |  |
Percent paid in equity shares |  | 50.00% |  |
Top leaders [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Percent paid in cash |  | 70.00% |  |
Percent paid in equity shares |  | 30.00% |  |
Long-term Incentive Plan [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 3 years |  |  |
Number of metrics | metric | 4 |  |  |
Restricted awards [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period |  | 3 years |  |
Minimum [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share savings plan holding period | 3 years |  |  |
Minimum [member] | Long-term Incentive Plan [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Target incentive percent of base salary | 30.00% |  |  |
Payout percent | 0.00% |  |  |
Maximum [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share savings plan holding period | 5 years |  |  |
Maximum [member] | Long-term Incentive Plan [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Target incentive percent of base salary | 430.00% |  |  |
Payout percent | 200.00% |  |  |

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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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