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FINANCIAL ASSETS AND LIABILITIES - Levels of Fair value (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets $ 1,164 $ 496
Fair value of liabilities 12,110 11,570
Financial assets at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 81 85
Financial assets at fair value | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 81 85
Financial assets at fair value | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 81 56
Financial assets at fair value | Level 3 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets   29
Foreign exchange contracts | Financial assets at fair value through profit or loss    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 5 2
Foreign exchange contracts | Financial assets at fair value through profit or loss | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 5 2
Foreign exchange contracts | Financial assets at fair value through profit or loss | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 5 2
Embedded derivatives in notes | Financial assets at fair value through profit or loss    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 5 12
Embedded derivatives in notes | Financial assets at fair value through profit or loss | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 5 12
Embedded derivatives in notes | Financial assets at fair value through profit or loss | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 5 12
Available-for-sale financial instruments | Available for sale financial instruments    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 71 71
Available-for-sale financial instruments | Available for sale financial instruments | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 71 71
Available-for-sale financial instruments | Available for sale financial instruments | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 71 42
Available-for-sale financial instruments | Available for sale financial instruments | Level 3 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets   29
Financial liabilities at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 109 83
Financial liabilities at fair value | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 109 83
Financial liabilities at fair value | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 60 36
Financial liabilities at fair value | Level 3 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 49 47
Foreign exchange contracts | Financial liabilities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   29
Foreign exchange contracts | Financial liabilities at fair value through profit or loss | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   29
Foreign exchange contracts | Financial liabilities at fair value through profit or loss | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   29
Foreign exchange contracts | Derivatives designated as hedges | Derivatives designated as cash flow hedges    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   4
Foreign exchange contracts | Derivatives designated as hedges | Derivatives designated as cash flow hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   4
Foreign exchange contracts | Derivatives designated as hedges | Level 2 | Derivatives designated as cash flow hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   4
Interest rate exchange contracts | Derivatives designated as cash flow hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 1  
Interest rate exchange contracts | Level 2 | Derivatives designated as cash flow hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 1  
Interest rate exchange contracts | Derivatives designated as hedges | Derivatives designated as cash flow hedges    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 1 3
Interest rate exchange contracts | Derivatives designated as hedges | Derivatives designated as cash flow hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   3
Interest rate exchange contracts | Derivatives designated as hedges | Level 2 | Derivatives designated as cash flow hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   3
Contingent consideration | Financial liabilities at fair value through profit or loss    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 49 47
Contingent consideration | Financial liabilities at fair value through profit or loss | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 49  
Contingent consideration | Financial liabilities at fair value through profit or loss | Level 3 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 49  
Contingent consideration | Derivatives designated as hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   47
Contingent consideration | Derivatives designated as hedges | Level 3 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities   $ 47
Cross currency interest rate exchange contracts | Derivatives designated as hedges | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 59  
Cross currency interest rate exchange contracts | Derivatives designated as hedges | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities $ 59