Financial Instruments and Risk Management (Market risk - Terms of Derivative Financial Instruments Used to Economically Hedge Foreign Currency Risk) (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Put options [Member] \| Euro/U.S Dollar [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0	$ 0
Stated amount	$ 47	$ 45
Average exchange rate	1.2	1.1
Put options [Member] \| U.S Dollar/British Pound [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0	$ 0
Stated amount	$ 10	$ 15
Average exchange rate	1.3	1.3
Put options [Member] \| U.S Dollar/Israeli Shekel [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 13	$ 4
Stated amount	$ 400	$ 600
Average exchange rate	3.3	3.4
Put options [Member] \| U.S Dollar/Japanese Yen [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0	$ 0
Stated amount	$ 2	$ 1
Average exchange rate	107	108.5
Call options [Member] \| Euro/U.S Dollar [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ (2)	$ 1
Stated amount	$ 47	$ 45
Average exchange rate	1.2	1.1
Call options [Member] \| U.S Dollar/British Pound [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0
Stated amount	$ 10
Average exchange rate	1.3
Call options [Member] \| U.S Dollar/Israeli Shekel [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ (1)	$ 0
Stated amount	$ 380	$ 440
Average exchange rate	3.3	3.4
Call options [Member] \| U.S Dollar/Japanese Yen [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0
Stated amount	$ 2
Average exchange rate	107
Swap contract [Member] \| Euro/U.S Dollar [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ (41)	$ (3)
Stated amount	$ 324	$ 447
Average exchange rate	1.1	1.1
Swap contract [Member] \| U.S Dollar/British Pound [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 5
Stated amount	$ 63
Average exchange rate	1.3
Swap contract [Member] \| U.S Dollar/Israeli Shekel [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 87	$ 57
Stated amount	$ 701	$ 482
Average exchange rate	3.7	3.7
SWAP contracts from variable interest to fixed interest [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ (13)	$ (6)
Stated amount	150	150
SWAP contracts from variable USD interest to fixed EUR interest [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	(41)	(3)
Stated amount	324	447
SWAP contracts from fixed ILS interest to fixed USD interest [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	87	57
Stated amount	701	482
Forward contracts [Member] \| Euro/U.S Dollar [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	0	(1)
Stated amount	$ 150	$ 61
Average exchange rate	1.2	1.1
Forward contracts [Member] \| U.S Dollar/British Pound [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0	$ 0
Stated amount	$ 27	$ 33
Average exchange rate	1.4	1.3
Forward contracts [Member] \| U.S Dollar/Israeli Shekel [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 8	$ 0
Stated amount	$ 377	$ 309
Average exchange rate	3.2	3.5
Forward contracts [Member] \| U.S Dollar/Chinese Yuan Renminbi [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0	$ 0
Stated amount	$ 23	$ 28
Average exchange rate	6.6	7.1
Forward contracts [Member] \| Other [Member]
Disclosure of detailed information about hedges [Line Items]
Carrying amount	$ 0	$ 4
Stated amount	$ 53	$ 56
Average exchange rate	0	0.9

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 22
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b
-URIDate 2020-01-01

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- Definition

The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24A
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24A_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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- Details

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- Details

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- Details

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- Details

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