EMPLOYEE STOCK BENEFIT PLANS - Summary of Stock Compensation Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted-average exercise price per stock
Total intrinsic value of stock options exercised	$ 90	$ 526	$ 512
Stock Options
Stock compensation activity, shares
Stock options, beginning balance (in shares)	21.9
Stock options, granted (in shares)	0.0
Stock options, released/exercised (in shares)	(4.8)
Stock options, adjustments for actual payout (in shares)	0.0
Stock options, forfeited/canceled (in shares)	(0.9)
Stock options, ending balance (in shares)	16.2	21.9
Weighted-average exercise price per stock
Stock options, weighted-average exercise price at the beginning of the period (in dollars per share)	$ 55.25
Stock options, granted, weighted-average exercise price at the beginning of the period (in dollars per share)	0
Stock options, released/exercised, weighted-average exercise price at the beginning of the period (in dollars per share)	46.79
Stock options, adjustments for actual payout, weighted-average exercise price at the beginning of the period (in dollars per share)	0
Stock options, forfeited/canceled, weighted-average exercise price at the beginning of the period (in dollars per share)	63.49
Stock options, weighted-average exercise price at the end of the period (in dollars per share)	$ 57.34	$ 55.25
RSUs
Stock compensation activity, shares
Other than options, beginning balance (in shares)	16.9
Other than options, granted (in shares)	9.5
Other than options, released/exercised (in shares)	(6.3)
Other than options, adjustments for actual payout (in shares)	0.0
Other than options, forfeited/canceled (in shares)	(2.1)
Other than options, ending balance (in shares)	18.0	16.9
Weighted-average exercise price per stock
Other than options, weighted average grant date fair value at the beginning of the period (in usd per share)	$ 59.17
Other than options, granted, weighted average grant date fair value (in usd per share)	60.26	$ 64.12	$ 56.58
Other than options, released/exercised, weighted average grant date fair value (in usd per share)	57.57
Other than options, adjustments for actual payout, weighted average grant date fair value (in usd per share)	0
Other than options, forfeited/canceled, weighted average grant date fair value (in usd per share)	60.10
Other than options, weighted average grant date fair value at the end of the period (in usd per share)	$ 60.21	$ 59.17
Other than options, expected to vest (in shares)	15.8
Other than options, expected to vest, weighted average grant date fair value (in usd per share)	$ 60.14
Unrecognized compensation cost	$ 763
Expected weighted-average period in years of compensation cost to be recognized	2 years 6 months
Fair value of awards that vested during the year	$ 365	$ 300	$ 246
RSUs | Legacy Celgene Plans
Weighted-average exercise price per stock
Fair value of awards that vested during the year	$ 0	$ 152	$ 519
MSUs
Stock compensation activity, shares
Other than options, beginning balance (in shares)	1.8
Other than options, granted (in shares)	1.0
Other than options, released/exercised (in shares)	(0.7)
Other than options, adjustments for actual payout (in shares)	0.1
Other than options, forfeited/canceled (in shares)	(0.3)
Other than options, ending balance (in shares)	1.9	1.8
Weighted-average exercise price per stock
Other than options, weighted average grant date fair value at the beginning of the period (in usd per share)	$ 58.25
Other than options, granted, weighted average grant date fair value (in usd per share)	57.99	$ 60.74	$ 58.04
Other than options, released/exercised, weighted average grant date fair value (in usd per share)	56.64
Other than options, adjustments for actual payout, weighted average grant date fair value (in usd per share)	54.42
Other than options, forfeited/canceled, weighted average grant date fair value (in usd per share)	58.78
Other than options, weighted average grant date fair value at the end of the period (in usd per share)	$ 58.52	$ 58.25
Other than options, expected to vest (in shares)	1.6
Other than options, expected to vest, weighted average grant date fair value (in usd per share)	$ 58.50
Unrecognized compensation cost	$ 49
Expected weighted-average period in years of compensation cost to be recognized	2 years 8 months 12 days
Fair value of awards that vested during the year	$ 45	$ 44	$ 37
PSUs
Stock compensation activity, shares
Other than options, beginning balance (in shares)	3.5
Other than options, granted (in shares)	1.5
Other than options, released/exercised (in shares)	(1.1)
Other than options, adjustments for actual payout (in shares)	0.1
Other than options, forfeited/canceled (in shares)	(0.4)
Other than options, ending balance (in shares)	3.6	3.5
Weighted-average exercise price per stock
Other than options, weighted average grant date fair value at the beginning of the period (in usd per share)	$ 60.88
Other than options, granted, weighted average grant date fair value (in usd per share)	63.86	$ 66.76	$ 59.04
Other than options, released/exercised, weighted average grant date fair value (in usd per share)	55.59
Other than options, adjustments for actual payout, weighted average grant date fair value (in usd per share)	55.59
Other than options, forfeited/canceled, weighted average grant date fair value (in usd per share)	64.29
Other than options, weighted average grant date fair value at the end of the period (in usd per share)	$ 63.32	$ 60.88
Other than options, expected to vest (in shares)	2.9
Other than options, expected to vest, weighted average grant date fair value (in usd per share)	$ 63.07
Unrecognized compensation cost	$ 75
Expected weighted-average period in years of compensation cost to be recognized	1 year 7 months 6 days
Fair value of awards that vested during the year	$ 65	$ 68	$ 61