ALLIANCES - Financial Information Pertaining to Alliances (Nektar) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development	$ 11,354	$ 11,143	$ 6,148
Collaborative Arrangement | Nektar
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost share, percentage, combination studies					67.50%
Percentage of pretax profit and loss shared with BMS					35.00%
Upfront payments for licensing and alliance arrangements				$ 1,850
Ownership interest				4.80%
Common stock lock up period (in years)				5 years
Equity investment in collaborative partner				$ 800
Upfront payment allocated to research and development expenses				$ 1,050
Consideration for contingent development and regulatory approval	1,800
Research and development	$ 98	$ 132	$ 108
Common Stock | Collaborative Arrangement | Nektar
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity received in collaborative partner (in shares)				8.3