Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
Dec. 31, 2019 |
|
| Finite-Lived Intangible Assets | |||
| Gross carrying amount | $ 27,336,000,000 | $ 27,345,000,000 | |
| Accumulated amortization | (9,133,000,000) | (8,696,000,000) | |
| Net carrying amount | 18,203,000,000 | 18,649,000,000 | |
| Amortization expense | 444,000,000 | $ 385,000,000 | |
| Definite-lived intangible assets impairment charges | 0 | 0 | |
| Indefinite-lived intangible asset impairment charges | 0 | $ 0 | |
| Developed product rights | |||
| Finite-Lived Intangible Assets | |||
| Gross carrying amount | 19,538,000,000 | 19,547,000,000 | |
| Accumulated amortization | (6,687,000,000) | (6,405,000,000) | |
| Net carrying amount | 12,851,000,000 | 13,142,000,000 | |
| License agreements | |||
| Finite-Lived Intangible Assets | |||
| Gross carrying amount | 7,798,000,000 | 7,798,000,000 | |
| Accumulated amortization | (2,446,000,000) | (2,291,000,000) | |
| Net carrying amount | $ 5,352,000,000 | $ 5,507,000,000 | |