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Risk management and financial instruments - Interest Rate Risk (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Cash and restricted cash	$ 644	$ 723	$ 1,020	$ 1,357
Impact of 1% increase in rates	6
Senior under-secured external debt	5,662	0
Debt instruments	6,208	6,177
Segment Reconciling Items
Debt Instrument [Line Items]
Cash and restricted cash	644	723
Secured debt | Senior Secured Notes
Debt Instrument [Line Items]
Debt instruments	$ 546	$ 515

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Liabilities Subject To Compromise, Debt

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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. Cash equivalents include, but are not limited to, 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.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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