The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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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

The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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Nominal or face amount used to calculate payments on the derivative asset.

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Nominal or face amount used to calculate payments on the derivative liability.

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- Definition

Average payable interest rate relating to interest rate derivatives.

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- Definition

Average receivable interest rate relating to interest rate derivatives.

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- Definition

The amount of cash outflow (inflow) from settlement of derivatives.

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Additional information about derivatives financial instruments - Protection program for EUR denominated debt instruments (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (67)	$ (240)	$ (1,602)
EUR fixed rate vs. US$ fixed rate swap
Derivative financial instruments.
Receivable \| €				€ 500		€ 500
Payable					$ 613		$ 613
Average receivable rate				3.75%	3.75%
Average payable rate				4.29%	4.29%
Fair value of liabilities					$ (1)		$ 23
Financial settlement inflows (outflows)	$ (3)
Value at risk					8
EUR fixed rate vs. US$ fixed rate swap \| 2019
Derivative financial instruments.
Fair value of liabilities					(7)
EUR fixed rate vs. US$ fixed rate swap \| 2020
Derivative financial instruments.
Fair value of liabilities					(5)
EUR fixed rate vs. US$ fixed rate swap \| 2021+
Derivative financial instruments.
Fair value of assets					$ 9