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Fair value measurement (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Assets:    
Interest-bearing securities $ 12,275 $ 9,845
Equity securities 865 477
Derivatives:    
Total assets 13,415 10,671
Derivatives:    
Contingent consideration obligations 35 33
Total liabilities 554 603
Foreign currency contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 127 28
Derivatives:    
Foreign currency and cross-currency swap contracts 54 237
Cross-currency swap contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 119 255
Derivatives:    
Foreign currency and cross-currency swap contracts 360 318
Interest rate swap contracts [Member]    
Derivatives:    
Interest rate swap contracts 29 66
Derivatives:    
Interest rate swap contracts 105 15
Quoted prices in active markets for identical assets (Level 1) [Member]    
Assets:    
Equity securities 608 477
Derivatives:    
Total assets 12,882 10,320
Derivatives:    
Contingent consideration obligations 0 0
Total liabilities 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Foreign currency contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Cross-currency swap contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Interest rate swap contracts [Member]    
Derivatives:    
Interest rate swap contracts 0 0
Derivatives:    
Interest rate swap contracts 0 0
Significant other observable inputs (Level 2) [Member]    
Assets:    
Equity securities 0 0
Derivatives:    
Total assets 276 351
Derivatives:    
Contingent consideration obligations 0 0
Total liabilities 519 570
Significant other observable inputs (Level 2) [Member] | Foreign currency contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 127 28
Derivatives:    
Foreign currency and cross-currency swap contracts 54 237
Significant other observable inputs (Level 2) [Member] | Cross-currency swap contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 119 255
Derivatives:    
Foreign currency and cross-currency swap contracts 360 318
Significant other observable inputs (Level 2) [Member] | Interest rate swap contracts [Member]    
Derivatives:    
Interest rate swap contracts 29 66
Derivatives:    
Interest rate swap contracts 105 15
Significant unobservable inputs (Level 3) [Member]    
Assets:    
Equity securities 257 0
Derivatives:    
Total assets 257 0
Derivatives:    
Contingent consideration obligations 35 33
Total liabilities 35 33
Significant unobservable inputs (Level 3) [Member] | Foreign currency contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Significant unobservable inputs (Level 3) [Member] | Cross-currency swap contracts [Member]    
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Derivatives:    
Foreign currency and cross-currency swap contracts 0 0
Significant unobservable inputs (Level 3) [Member] | Interest rate swap contracts [Member]    
Derivatives:    
Interest rate swap contracts 0 0
Derivatives:    
Interest rate swap contracts 0 0
U.S. Treasury notes [Member]    
Assets:    
Interest-bearing securities 51 130
U.S. Treasury notes [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Assets:    
Interest-bearing securities 51 130
U.S. Treasury notes [Member] | Significant other observable inputs (Level 2) [Member]    
Assets:    
Interest-bearing securities 0 0
U.S. Treasury notes [Member] | Significant unobservable inputs (Level 3) [Member]    
Assets:    
Interest-bearing securities 0 0
U.S. Treasury bills [Member]    
Assets:    
Interest-bearing securities 3,900 4,948
U.S. Treasury bills [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Assets:    
Interest-bearing securities 3,900 4,948
U.S. Treasury bills [Member] | Significant other observable inputs (Level 2) [Member]    
Assets:    
Interest-bearing securities 0 0
U.S. Treasury bills [Member] | Significant unobservable inputs (Level 3) [Member]    
Assets:    
Interest-bearing securities 0 0
Money market mutual funds [Member]    
Assets:    
Interest-bearing securities 8,323 4,765
Money market mutual funds [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Assets:    
Interest-bearing securities 8,323 4,765
Money market mutual funds [Member] | Significant other observable inputs (Level 2) [Member]    
Assets:    
Interest-bearing securities 0 0
Money market mutual funds [Member] | Significant unobservable inputs (Level 3) [Member]    
Assets:    
Interest-bearing securities 0 0
Other short-term interest-bearing securities [Member]    
Assets:    
Interest-bearing securities 1 2
Other short-term interest-bearing securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]    
Assets:    
Interest-bearing securities 0 0
Other short-term interest-bearing securities [Member] | Significant other observable inputs (Level 2) [Member]    
Assets:    
Interest-bearing securities 1 2
Other short-term interest-bearing securities [Member] | Significant unobservable inputs (Level 3) [Member]    
Assets:    
Interest-bearing securities $ 0 $ 0