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Risk management and financial instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Restricted cash | $ 216 | $ 197
Fair value, recurring basis | Level 1 | Carrying value |  |
Assets |  |
Cash and cash equivalents | 428 | 526
Restricted cash | 216 | 197
Marketable securities | 13 | 8
Fair value, recurring basis | Level 1 | Fair value |  |
Assets |  |
Cash and cash equivalents | 428 | 526
Restricted cash | 216 | 197
Marketable securities | 13 | 8
Fair value, recurring basis | Level 3 |  |
Assets |  |
Related party loans receivable |  | 85
Fair value, recurring basis | Level 3 | Carrying value |  |
Assets |  |
Related party loans receivable | 19 | 13
Fair value, recurring basis | Level 3 | Fair value |  |
Assets |  |
Related party loans receivable | $ 19 | $ 13

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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