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Fair value measurement - (Fair Value of Financial Assets and Liabilities on Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Interest-bearing securities | $ 8,234 | $ 28,724
Equity securities | 303 | 176
Derivatives: |  |
Total assets | 9,086 | 29,308
Derivatives: |  |
Contingent consideration obligations | 61 | 72
Total liabilities | 407 | 648
Foreign currency contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 224 | 182
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 31 | 26
Cross-currency swap contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 66 | 170
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 315 | 401
Interest rate swap contracts [Member] |  |
Derivatives: |  |
Interest rate swap contracts | 259 | 56
Derivatives: |  |
Interest rate swap contracts | 0 | 149
U.S. Treasury notes [Member] |  |
Assets: |  |
Interest-bearing securities | 360 | 2,663
U.S. Treasury bills [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 8,191
Other government-related debt securities - U.S. [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 110
Other government-related debt securities - Foreign and other [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 932
Corporate debt securities - Financial [Member] |  |
Assets: |  |
Interest-bearing securities | 1,121 | 2,697
Corporate debt securities - Industrial [Member] |  |
Assets: |  |
Interest-bearing securities | 834 | 2,504
Corporate debt securities - Other [Member] |  |
Assets: |  |
Interest-bearing securities | 198 | 562
Residential mortgage-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 182 | 1,422
Other mortgage- and asset-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 469
Money market mutual funds [Member] |  |
Assets: |  |
Interest-bearing securities | 5,250 | 5,659
Other short-term interest-bearing securities [Member] |  |
Assets: |  |
Interest-bearing securities | 289 | 3,515
Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Equity securities | 303 | 176
Derivatives: |  |
Total assets | 5,913 | 16,689
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
Quoted prices in active markets for identical assets (Level 1) [Member] | U.S. Treasury notes [Member] |  |
Assets: |  |
Interest-bearing securities | 360 | 2,663
Quoted prices in active markets for identical assets (Level 1) [Member] | U.S. Treasury bills [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 8,191
Quoted prices in active markets for identical assets (Level 1) [Member] | Other government-related debt securities - U.S. [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Other government-related debt securities - Foreign and other [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate debt securities - Financial [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate debt securities - Industrial [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Corporate debt securities - Other [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Other mortgage- and asset-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Money market mutual funds [Member] |  |
Assets: |  |
Interest-bearing securities | 5,250 | 5,659
Quoted prices in active markets for identical assets (Level 1) [Member] | Other short-term interest-bearing securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Equity securities | 0 | 0
Derivatives: |  |
Total assets | 3,173 | 12,619
Derivatives: |  |
Contingent consideration obligations | 0 | 0
Total liabilities | 346 | 576
Significant other observable inputs (Level 2) [Member] | Foreign currency contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 224 | 182
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 31 | 26
Significant other observable inputs (Level 2) [Member] | Cross-currency swap contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 66 | 170
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 315 | 401
Significant other observable inputs (Level 2) [Member] | Interest rate swap contracts [Member] |  |
Derivatives: |  |
Interest rate swap contracts | 259 | 56
Derivatives: |  |
Interest rate swap contracts | 0 | 149
Significant other observable inputs (Level 2) [Member] | U.S. Treasury notes [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant other observable inputs (Level 2) [Member] | U.S. Treasury bills [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant other observable inputs (Level 2) [Member] | Other government-related debt securities - U.S. [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 110
Significant other observable inputs (Level 2) [Member] | Other government-related debt securities - Foreign and other [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 932
Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Financial [Member] |  |
Assets: |  |
Interest-bearing securities | 1,121 | 2,697
Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Industrial [Member] |  |
Assets: |  |
Interest-bearing securities | 834 | 2,504
Significant other observable inputs (Level 2) [Member] | Corporate debt securities - Other [Member] |  |
Assets: |  |
Interest-bearing securities | 198 | 562
Significant other observable inputs (Level 2) [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 182 | 1,422
Significant other observable inputs (Level 2) [Member] | Other mortgage- and asset-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 469
Significant other observable inputs (Level 2) [Member] | Money market mutual funds [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant other observable inputs (Level 2) [Member] | Other short-term interest-bearing securities [Member] |  |
Assets: |  |
Interest-bearing securities | 289 | 3,515
Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Equity securities | 0 | 0
Derivatives: |  |
Total assets |  | 0
Derivatives: |  |
Contingent consideration obligations | 61 | 72
Total liabilities | 61 | 72
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
Significant unobservable inputs (Level 3) [Member] | U.S. Treasury notes [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | U.S. Treasury bills [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Other government-related debt securities - U.S. [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Other government-related debt securities - Foreign and other [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Corporate debt securities - Financial [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Corporate debt securities - Industrial [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Corporate debt securities - Other [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Other mortgage- and asset-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Money market mutual funds [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Other short-term interest-bearing securities [Member] |  |
Assets: |  |
Interest-bearing securities | $ 0 | $ 0

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