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Financial Instruments and Risk Management (Credit Risk - Aging of Trade Receivables) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Gross [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | $ 781 | $ 993
Gross [Member] | Not past due [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 686 | 829
Gross [Member] | Past due up to 3 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 65 | 114
Gross [Member] | Past due 3 to 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 26 | 38
Gross [Member] | Past due over 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 4 | 12
Accumulated impairment [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | (3) | (3)
Accumulated impairment [Member] | Not past due [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 0 | 0
Accumulated impairment [Member] | Past due up to 3 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 0 | 0
Accumulated impairment [Member] | Past due 3 to 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | (1) | (1)
Accumulated impairment [Member] | Past due over 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | $ (2) | $ (2)

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