Contingencies and Certain Commitments (Commitments and Contingent Consideration for Acquisitions) (Details) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | |
|---|---|---|---|
Apr. 30, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Loss Contingencies [Line Items] | |||
| Long-term purchase commitment, amount | $ 2,500 | ||
| Repatriation tax liability | 15,000 | ||
| Payment for repatriation tax | $ 750 | ||
| Fair value of contingent consideration | 711 | $ 988 | |
| Contingent consideration liability, current | 160 | 280 | |
| Contingent consideration liability, noncurrent | $ 551 | $ 708 | |
| Besponsa [Member] | |||
| Loss Contingencies [Line Items] | |||
| Research and development arrangement, aggregate payment obligation, term | 7 years | ||
| Research arrangement, fixed payment obligation | $ 412 | ||
| Bosulif [Member] | |||
| Loss Contingencies [Line Items] | |||
| Research and development arrangement, aggregate payment obligation, term | 8 years | ||
| Research arrangement, fixed payment obligation | $ 217 | ||
| Income Taxes Payable [Member] | |||
| Loss Contingencies [Line Items] | |||
| Repatriation tax liability | $ 600 |