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Financial instruments - additional disclosures (Details 7) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of derivative financial instruments [line items]    
Provisions and other non-current liabilities $ 6,934 $ 6,632
Assets and liabilities classified as held for sale [member]    
Disclosure of derivative financial instruments [line items]    
Provisions and other non-current liabilities   4
Associated companies at fair value through profit and loss [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period 186 145
Fair value gains and other adjustments including from divestments recognized in the consolidated income statement 57  
Fair value losses (including impairments and amortizations) and other adjustments recognized in the consolidated income statement (18) (15)
Fair value adjustments recognized in the consolidated statement of comprehensive income 4  
Purchases fair value measurement assets 24 49
Disposals fair value measurement assets (23) (3)
Reclassification fair value measurement assets (19) 10
Fair value measurement, carrying value, level 3, at end of period 211 186
Total fair value gains and (losses) recognized in the consolidated income statement for assets and liabilities held at period end 39 (15)
Fund investments [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period 233 251
Fair value gains and other adjustments including from divestments recognized in the consolidated income statement 151 12
Fair value losses (including impairments and amortizations) and other adjustments recognized in the consolidated income statement (8)  
Fair value adjustments recognized in the consolidated statement of comprehensive income 3  
Purchases fair value measurement assets 17 28
Disposals fair value measurement assets (61) (30)
Reclassification fair value measurement assets 31  
Fair value measurement, carrying value, level 3, at end of period 366 233
Total fair value gains and (losses) recognized in the consolidated income statement for assets and liabilities held at period end 143 12
Long term financial investments [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period 581 488
Fair value gains and other adjustments including from divestments recognized in the consolidated income statement 34 6
Fair value losses (including impairments and amortizations) and other adjustments recognized in the consolidated income statement (39)  
Fair value adjustments recognized in the consolidated statement of comprehensive income 33 (6)
Purchases fair value measurement assets 123 229
Disposals fair value measurement assets (109) (53)
Reclassification fair value measurement assets (163) (64)
Fair value measurement, carrying value, level 3, at end of period 460 581
Total fair value gains and (losses) recognized in the consolidated income statement for assets and liabilities held at period end (5) 6
Contingent consideration receivables [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period 399 396
Fair value gains and other adjustments including from divestments recognized in the consolidated income statement 173 35
Fair value adjustments recognized in the consolidated statement of comprehensive income 40  
Purchases fair value measurement assets 43  
Cash receipts and payments fair value measurement assets (30) (32)
Fair value measurement, carrying value, level 3, at end of period 625 399
Total fair value gains and (losses) recognized in the consolidated income statement for assets and liabilities held at period end 173 35
Contingent consideration payables [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period (1,036) (907)
Fair value gains and other adjustments including from divestments recognized in the consolidated income statement 206 195
Fair value losses (including impairments and amortizations) and other adjustments recognized in the consolidated income statement (90) (89)
Fair value adjustments recognized in the consolidated statement of comprehensive income (62)  
Purchases fair value measurement assets (123) (401)
Cash receipts and payments fair value measurement assets 63 3
Reclassification fair value measurement assets (4)  
Fair value measurement, carrying value, level 3, at end of period (1,046) (1,036)
Total fair value gains and (losses) recognized in the consolidated income statement for assets and liabilities held at period end 116 106
Other financial liabilities [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period (29) (10)
Fair value gains and other adjustments including from divestments recognized in the consolidated income statement   1
Fair value losses (including impairments and amortizations) and other adjustments recognized in the consolidated income statement (3) (48)
Fair value adjustments recognized in the consolidated statement of comprehensive income (2)  
Purchases fair value measurement assets   (5)
Cash receipts and payments fair value measurement assets 11 33
Fair value measurement, carrying value, level 3, at end of period (23) (29)
Total fair value gains and (losses) recognized in the consolidated income statement for assets and liabilities held at period end $ (3) (47)
Discontinued operations [member] | Fund investments [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period   (28)
Discontinued operations [member] | Long term financial investments [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period   (19)
Discontinued operations [member] | Contingent consideration payables [member]    
Disclosure of derivative financial instruments [line items]    
Fair value measurement, carrying value, level 3, at beginning of period   $ 163