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FINANCIAL ASSETS AND LIABILITIES - Levels of Fair value (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets $ 99 $ 1,164
Fair value of liabilities 10,697 12,110
Financial assets at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 59 81
Financial assets at fair value | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 59 81
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 59 81
Financial assets at fair value | Financial assets at fair value through other comprehensive income    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 56  
Financial assets at fair value | Financial assets at fair value through other comprehensive income | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 56  
Financial assets at fair value | Financial assets at fair value through other comprehensive income | Level 2 | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets 56  
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 3 5
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 3 5
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 3 5
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
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
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
Available-for-sale financial instruments | Available for sale financial instruments    
Disclosure of fair value measurement of assets and liabilities    
Fair value of assets   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
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
Financial liabilities at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 104 109
Financial liabilities at fair value | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 104 109
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 55 60
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 49
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 7  
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 7  
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 7  
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
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   1
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   1
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 49
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 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 49
Cross currency interest rate exchange contracts | Derivatives designated as hedges | Net investment hedge accounting    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 48 59
Cross currency interest rate exchange contracts | Derivatives designated as hedges | Net investment hedge accounting | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities 48 59
Cross currency interest rate exchange contracts | Derivatives designated as hedges | Level 2 | Net investment hedge accounting | Financial instruments at fair value    
Disclosure of fair value measurement of assets and liabilities    
Fair value of liabilities $ 48 $ 59