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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Finite-lived assets |  |  |  |
Gross Carrying Amount | $ 25,915 |  |  | $ 22,897
Accumulated Amortization | (8,381) |  |  | (6,660)
Foreign Currency Translation Adjustment | 1 |  |  | (1)
Total | 17,535 |  |  | 16,236
Total intangible assets |  |  |  |
Gross Carrying Amount | 41,835 |  |  | 39,787
Accumulated Amortization | (8,381) |  |  | (6,660)
Foreign Currency Translation Adjustment | 1 |  |  | (1)
Net Carrying Amount | 33,455 |  |  | 33,126
Acquired IPR&D |  |  |  |
Indefinite-lived assets - IPR&D |  |  |  |
Gross Carrying Amount | 15,920 |  |  | 16,890
Foreign Currency Translation Adjustment | 0 |  |  | 0
Net Carrying Amount | 15,920 |  |  | 16,890
Total intangible assets |  |  |  |
Reclassified intangible assets |  | $ (1,000) | $ (910) |
Intangible asset - sofosbuvir |  |  |  |
Finite-lived assets |  |  |  |
Gross Carrying Amount | 10,720 |  |  | 10,720
Accumulated Amortization | (5,651) |  |  | (4,952)
Foreign Currency Translation Adjustment | 0 |  |  | 0
Total | 5,069 |  |  | 5,768
Total intangible assets |  |  |  |
Accumulated Amortization | (5,651) |  |  | (4,952)
Intangible asset - axicabtagene ciloleucel |  |  |  |
Finite-lived assets |  |  |  |
Gross Carrying Amount | 7,110 |  |  | 6,200
Accumulated Amortization | (1,501) |  |  | (1,105)
Foreign Currency Translation Adjustment | 0 |  |  | 0
Total | 5,609 |  |  | 5,095
Total intangible assets |  |  |  |
Accumulated Amortization | (1,501) |  |  | (1,105)
Reclassified intangible assets |  |  | $ 910 |
Intangible asset - Trodelvy |  |  |  |
Finite-lived assets |  |  |  |
Gross Carrying Amount | 5,630 |  |  | 4,600
Accumulated Amortization | (507) |  |  | (63)
Foreign Currency Translation Adjustment | 0 |  |  | 0
Total | 5,123 |  |  | 4,537
Total intangible assets |  |  |  |
Accumulated Amortization | (507) |  |  | (63)
Reclassified intangible assets |  | $ 1,000 |  |
Intangible asset - Hepcludex |  |  |  |
Finite-lived assets |  |  |  |
Gross Carrying Amount | 845 |  |  | 0
Accumulated Amortization | (72) |  |  | 0
Foreign Currency Translation Adjustment | 0 |  |  | 0
Total | 773 |  |  | 0
Total intangible assets |  |  |  |
Accumulated Amortization | (72) |  |  | 0
Other |  |  |  |
Finite-lived assets |  |  |  |
Gross Carrying Amount | 1,610 |  |  | 1,377
Accumulated Amortization | (650) |  |  | (540)
Foreign Currency Translation Adjustment | 1 |  |  | (1)
Total | 961 |  |  | 836
Total intangible assets |  |  |  |
Accumulated Amortization | (650) |  |  | $ (540)
Reclassified intangible assets | (200) |  |  |
Tecartus |  |  |  |
Total intangible assets |  |  |  |
Reclassified intangible assets | $ 200 |  |  |

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