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Cash and cash equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [abstract]
Cash at bank available	$ 1,648	$ 1,666
Time deposits	1,132	604
Money Market Funds	492	700
Interest bearing securities	2,485	1,656
Disclosure of financial assets [line items]
Restricted cash, including margin deposits	999	552
Cash and cash equivalents	6,757	5,177	$ 7,556	$ 4,390
Collateral deposits related to trading activities	425	$ 414
Nigeria [member]
Disclosure of financial assets [line items]
Restricted cash, including margin deposits	$ 574

X

- Definition

Cash deposits held as collateral that is permitted to sold or repledged the absence of default by the owner of the collateral.

+ References

No definition available.

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- Definition

The amount represents inerest bearing securities.

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- Definition

The amount represets money market funds.

+ References

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- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
-Paragraph 45
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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

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Amount of cash and cash equivalents 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. 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.

+ References

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