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Classification and measurement of financial instruments - Summary of Carrying Amounts and Fair Values of Financial Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities $ (3,767) $ (2,165) [1]
Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (333) (329) [1]
Financial liabilities at fair value through profit or loss, category [member] | Contingent purchase consideration [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (79) (91) [1]
Financial liabilities at amortised cost, category [member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (4,248) (2,758) [1]
Financial liabilities at amortised cost, category [member] | Deferred purchase consideration [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (24) (23) [1]
Financial liabilities at amortised cost, category [member] | Trade and other payables, excluding deferred and contingent purchase consideration [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (457) (570) [1]
Derivative financial instruments [Member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (18) (20) [1]
Money market fund [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 907 51
Deferred Compensation Plan Investments [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 236 218
Deferred Compensation Plan Investments [Member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 236 218 [1]
Financial assets measured at fair value through other comprehensive income [Member] | Equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 88 133 [1]
Financial assets at fair value through profit or loss, category [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,148 273 [1]
Financial assets at fair value through profit or loss, category [member] | Deferred Compensation Plan Liabilities [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial Liabilities (236) (218) [1]
Financial assets at fair value through profit or loss, category [member] | Cash and cash equivalent [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 892 35 [1]
Financial assets at fair value through profit or loss, category [member] | Other Financial Asset [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 15 16 [1]
Financial assets at fair value through profit or loss, category [member] | Derivative financial instruments [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 5 1 [1]
Financial assets at fair value through profit or loss, category [member] | Trade and other receivables, excluding prepayments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets   3
Financial assets at fair value through profit or loss, category [member] | Money market fund [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets [1]   3
Financial assets at amortised cost, category [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,287 848 [1]
Financial assets at amortised cost, category [member] | Cash and cash equivalent [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 783 160 [1]
Financial assets at amortised cost, category [member] | Other Financial Asset [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 66 136 [1]
Financial assets at amortised cost, category [member] | Trade and other receivables, excluding prepayments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 438 $ 552 [1]
[1] Restated for deferred compensation plan investments, see page 134.