Identifiable Intangible Assets and Goodwill - Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Finite-lived intangible assets, gross carrying amount | $ 76,759 | $ 75,058 | ||||||||
| Finite-lived intangible assets, accumulated amortization | [1] | (52,862) | (48,941) | |||||||
| Finite-lived intangible assets, less accumulated amortization | 23,896 | 26,117 | ||||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||||||
| Total indefinite-lived intangible assets | 4,575 | 7,819 | ||||||||
| Intangible assets, gross carrying amount | [1] | 81,334 | 82,877 | |||||||
| Identifiable Intangible Assets, less Accumulated Amortization | [1] | 28,471 | 33,936 | |||||||
| Brands [Member] | ||||||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||||||
| Total indefinite-lived intangible assets | 827 | 827 | ||||||||
| IPR&D [Member] | ||||||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||||||
| Total indefinite-lived intangible assets | [2] | 3,175 | 5,919 | |||||||
| Licensing Agreements and Other [Member] | ||||||||||
| Indefinite-lived Intangible Assets [Line Items] | ||||||||||
| Total indefinite-lived intangible assets | [3] | 573 | 1,073 | |||||||
| Developed Technology Rights [Member] | ||||||||||
| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Finite-lived intangible assets, gross carrying amount | [4] | 73,545 | 72,449 | |||||||
| Finite-lived intangible assets, accumulated amortization | [4] | (50,902) | (47,092) | |||||||
| Finite-lived intangible assets, less accumulated amortization | [4] | 22,643 | 25,357 | |||||||
| Brands [Member] | ||||||||||
| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Finite-lived intangible assets, gross carrying amount | 922 | 922 | ||||||||
| Finite-lived intangible assets, accumulated amortization | (774) | (741) | ||||||||
| Finite-lived intangible assets, less accumulated amortization | 148 | 181 | ||||||||
| Licensing Agreements and Other [Member] | ||||||||||
| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Finite-lived intangible assets, gross carrying amount | [3] | 2,292 | 1,687 | |||||||
| Finite-lived intangible assets, accumulated amortization | [3] | (1,186) | (1,108) | |||||||
| Finite-lived intangible assets, less accumulated amortization | [3] | $ 1,106 | $ 579 | |||||||
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