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Financial Instruments and Risk Management (Credit Risk - Aging of Trade Receivables) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | $ 993 | $ 943
Gross [Member] | Not past due [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 829 | 785
Gross [Member] | Past due up to 3 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 114 | 125
Gross [Member] | Past due 3 to 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 38 | 23
Gross [Member] | Past due over 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | 12 | 10
Accumulated impairment [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | (3) | (11)
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) | (6)
Accumulated impairment [Member] | Past due over 12 months [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Trade receivables | $ (2) | $ (5)

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