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Fair value measurement (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Interest-bearing securities | $ 25,652 | $ 28,724
Equity securities | 246 | 176
Derivatives: |  |
Total assets | 26,373 | 29,308
Derivatives: |  |
Contingent consideration obligations | 66 | 72
Total liabilities | 557 | 648
Foreign currency contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 238 | 182
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 8 | 26
Cross-currency swap contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 143 | 170
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 429 | 401
Interest rate swap contracts [Member] |  |
Derivatives: |  |
Interest rate swap contracts | 94 | 56
Derivatives: |  |
Interest rate swap contracts | 54 | 149
Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Equity securities | 246 | 176
Derivatives: |  |
Total assets | 10,778 | 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
Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Equity securities | 0 | 0
Derivatives: |  |
Total assets | 15,595 | 12,619
Derivatives: |  |
Contingent consideration obligations | 0 | 0
Total liabilities | 491 | 576
Significant other observable inputs (Level 2) [Member] | Foreign currency contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 238 | 182
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 8 | 26
Significant other observable inputs (Level 2) [Member] | Cross-currency swap contracts [Member] |  |
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 143 | 170
Derivatives: |  |
Foreign currency and cross-currency swap contracts | 429 | 401
Significant other observable inputs (Level 2) [Member] | Interest rate swap contracts [Member] |  |
Derivatives: |  |
Interest rate swap contracts | 94 | 56
Derivatives: |  |
Interest rate swap contracts | 54 | 149
Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Equity securities | 0 | 0
Derivatives: |  |
Total assets | 0 | 0
Derivatives: |  |
Contingent consideration obligations | 66 | 72
Total liabilities | 66 | 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
U.S. Treasury notes [Member] |  |
Assets: |  |
Interest-bearing securities | 2,682 | 2,663
U.S. Treasury notes [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 2,682 | 2,663
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 | 3,475 | 8,191
U.S. Treasury bills [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 3,475 | 8,191
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
Other government-related debt securities - U.S. [Member] |  |
Assets: |  |
Interest-bearing securities | 111 | 110
Other government-related debt securities - U.S. [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Other government-related debt securities - U.S. [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 111 | 110
Other government-related debt securities - U.S. [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Other government-related debt securities - Foreign and other [Member] |  |
Assets: |  |
Interest-bearing securities | 958 | 932
Other government-related debt securities - Foreign and other [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Other government-related debt securities - Foreign and other [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 958 | 932
Other government-related debt securities - Foreign and other [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Corporate debt securities - Financial [Member] |  |
Assets: |  |
Interest-bearing securities | 2,750 | 2,697
Corporate debt securities - Financial [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Corporate debt securities - Financial [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 2,750 | 2,697
Corporate debt securities - Financial [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Corporate debt securities - Industrial [Member] |  |
Assets: |  |
Interest-bearing securities | 2,458 | 2,504
Corporate debt securities - Industrial [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Corporate debt securities - Industrial [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 2,458 | 2,504
Corporate debt securities - Industrial [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Corporate debt securities - Other [Member] |  |
Assets: |  |
Interest-bearing securities | 566 | 562
Corporate debt securities - Other [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Corporate debt securities - Other [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 566 | 562
Corporate debt securities - Other [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Residential mortgage-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 1,382 | 1,422
Residential mortgage-backed securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Residential mortgage-backed securities [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 1,382 | 1,422
Residential mortgage-backed securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Other mortgage- and asset-backed securities [Member] |  |
Assets: |  |
Interest-bearing securities | 467 | 469
Other mortgage- and asset-backed securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Other mortgage- and asset-backed securities [Member] | Significant other observable inputs (Level 2) [Member] |  |
Assets: |  |
Interest-bearing securities | 467 | 469
Other mortgage- and asset-backed securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | 0 | 0
Money market mutual funds [Member] |  |
Assets: |  |
Interest-bearing securities | 4,375 | 5,659
Money market mutual funds [Member] | Quoted prices in active markets for identical assets (Level 1) [Member] |  |
Assets: |  |
Interest-bearing securities | 4,375 | 5,659
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 | 6,428 | 3,515
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 | 6,428 | 3,515
Other short-term interest-bearing securities [Member] | Significant unobservable inputs (Level 3) [Member] |  |
Assets: |  |
Interest-bearing securities | $ 0 | $ 0

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