FINANCING ARRANGEMENTS - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Principal Value	$ 38,886	$ 38,234
Unamortized basis adjustment from swap terminations	82	97
Unamortized bond discounts and issuance costs	(303)	(284)
Unamortized purchase price adjustments of Celgene debt	872	924
Total	39,526	38,953
Current portion of long-term debt	2,873	3,897
Long-term debt	$ 36,653	35,056
0.537% Notes due 2023
Debt Instrument [Line Items]
Interest rates	0.537%
Principal Value	$ 0	1,500
2.750% Notes due 2023
Debt Instrument [Line Items]
Interest rates	2.75%
Principal Value	$ 0	750
3.250% Notes due 2023
Debt Instrument [Line Items]
Interest rates	3.25%
Principal Value	$ 0	500
3.250% Notes due 2023
Debt Instrument [Line Items]
Interest rates	3.25%
Principal Value	$ 0	890
7.150% Notes due 2023
Debt Instrument [Line Items]
Interest rates	7.15%
Principal Value	$ 0	239
2.900% Notes due 2024
Debt Instrument [Line Items]
Interest rates	2.90%
Principal Value	$ 2,478	2,478
3.625% Notes due 2024
Debt Instrument [Line Items]
Interest rates	3.625%
Principal Value	$ 395	395
0.750% Notes due 2025
Debt Instrument [Line Items]
Interest rates	0.75%
Principal Value	$ 1,000	1,000
1.000% Euro Notes due 2025
Debt Instrument [Line Items]
Interest rates	1.00%
Principal Value	$ 636	613
3.875% Notes due 2025
Debt Instrument [Line Items]
Interest rates	3.875%
Principal Value	$ 229	229
3.200% Notes due 2026
Debt Instrument [Line Items]
Interest rates	3.20%
Principal Value	$ 1,750	1,750
6.800% Notes due 2026
Debt Instrument [Line Items]
Interest rates	6.80%
Principal Value	$ 256	256
1.125% Notes due 2027
Debt Instrument [Line Items]
Interest rates	1.125%
Principal Value	$ 1,000	1,000
3.250% Notes due 2027
Debt Instrument [Line Items]
Interest rates	3.25%
Principal Value	$ 512	512
3.450% Notes due 2027
Debt Instrument [Line Items]
Interest rates	3.45%
Principal Value	$ 534	534
3.900% Notes due 2028
Debt Instrument [Line Items]
Interest rates	3.90%
Principal Value	$ 1,500	1,500
3.400% Notes due 2029
Debt Instrument [Line Items]
Interest rates	3.40%
Principal Value	$ 2,400	2,400
1.450% Notes due 2030
Debt Instrument [Line Items]
Interest rates	1.45%
Principal Value	$ 1,250	1,250
5.750% Notes due 2031
Debt Instrument [Line Items]
Interest rates	5.75%
Principal Value	$ 1,000	0
2.950% Notes due 2032
Debt Instrument [Line Items]
Interest rates	2.95%
Principal Value	$ 1,750	1,750
5.900% Notes due 2033
Debt Instrument [Line Items]
Interest rates	5.90%
Principal Value	$ 1,000	0
1.750% Euro Notes due 2035
Debt Instrument [Line Items]
Interest rates	1.75%
Principal Value	$ 636	613
5.875% Notes due 2036
Debt Instrument [Line Items]
Interest rates	5.875%
Principal Value	$ 279	279
6.125% Notes due 2038
Debt Instrument [Line Items]
Interest rates	6.125%
Principal Value	$ 219	219
4.125% Notes due 2039
Debt Instrument [Line Items]
Interest rates	4.125%
Principal Value	$ 2,000	2,000
2.350% Notes due 2040
Debt Instrument [Line Items]
Interest rates	2.35%
Principal Value	$ 750	750
5.700% Notes due 2040
Debt Instrument [Line Items]
Interest rates	5.70%
Principal Value	$ 153	153
3.550% Notes due 2042
Debt Instrument [Line Items]
Interest rates	3.55%
Principal Value	$ 1,250	1,250
3.250% Notes due 2042
Debt Instrument [Line Items]
Interest rates	3.25%
Principal Value	$ 500	500
5.250% Notes due 2043
Debt Instrument [Line Items]
Interest rates	5.25%
Principal Value	$ 226	226
4.500% Notes due 2044
Debt Instrument [Line Items]
Interest rates	4.50%
Principal Value	$ 342	342
4.625% Notes due 2044
Debt Instrument [Line Items]
Interest rates	4.625%
Principal Value	$ 748	748
5.000% Notes due 2045
Debt Instrument [Line Items]
Interest rates	5.00%
Principal Value	$ 758	758
4.350% Notes due 2047
Debt Instrument [Line Items]
Interest rates	4.35%
Principal Value	$ 1,250	1,250
4.550% Notes due 2048
Debt Instrument [Line Items]
Interest rates	4.55%
Principal Value	$ 1,272	1,272
4.250% Notes due 2049
Debt Instrument [Line Items]
Interest rates	4.25%
Principal Value	$ 3,750	3,750
2.550% Notes due 2050
Debt Instrument [Line Items]
Interest rates	2.55%
Principal Value	$ 1,500	1,500
3.700% Notes due 2052
Debt Instrument [Line Items]
Interest rates	3.70%
Principal Value	$ 2,000	2,000
6.250% Notes due 2053
Debt Instrument [Line Items]
Interest rates	6.25%
Principal Value	$ 1,250	0
3.900% Notes due 2062
Debt Instrument [Line Items]
Interest rates	3.90%
Principal Value	$ 1,000	1,000
6.400% Notes due 2063
Debt Instrument [Line Items]
Interest rates	6.40%
Principal Value	$ 1,250	0
6.875% Notes due 2097
Debt Instrument [Line Items]
Interest rates	6.875%
Principal Value	$ 63	63
0.130% Convertible debt due 2023
Debt Instrument [Line Items]
Interest rates	0.13%
Principal Value	$ 0	15
Interest rate swap contracts
Debt Instrument [Line Items]
Fair value of interest rate swap contracts	$ (11)	$ (18)