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Financial instruments - additional disclosures (Details 5) - Recurring fair value measurement [member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 185 $ 163
Marketable securities, time deposits and derivative financial instruments [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 26 24
Marketable securities, time deposits and derivative financial instruments [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   37
Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 26 61
Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 159 102
Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 2,604 2,189
Financial investments and long-term loans [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 366 233
Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,613 1,557
Financial investments and long-term loans [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 625 399
Associated companies at fair value through profit and loss [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 211 186
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   37
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   37
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   37
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,153 976
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,153 976
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 185 126
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 26 24
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 26 24
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 159 102
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,451 1,213
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 366 233
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 460 581
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 625 399
Level 3 of fair value hierarchy [member] | Associated companies at fair value through profit and loss [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 211 $ 186