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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

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