FINANCING ARRANGEMENTS - Long-Term Debt (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Principal Value	$ 48,937,000,000	$ 38,886,000,000
Unamortized basis adjustment from swap terminations	71,000,000	82,000,000
Unamortized bond discounts and issuance costs	(390,000,000)	(303,000,000)
Unamortized purchase price adjustments of Celgene debt	823,000,000	872,000,000
Total	49,431,000,000	39,526,000,000
Current portion of Long-term debt	1,828,000,000	2,873,000,000
Long-term debt	$ 47,603,000,000	36,653,000,000
2.900% Notes due 2024
Debt Instrument [Line Items]
Interest rates	2.90%
Principal Value	$ 0	2,478,000,000
3.625% Notes due 2024
Debt Instrument [Line Items]
Interest rates	3.625%
Principal Value	$ 0	395,000,000
0.750% Notes due 2025
Debt Instrument [Line Items]
Interest rates	0.75%
Principal Value	$ 1,000,000,000	1,000,000,000
1.000% Euro Notes due 2025
Debt Instrument [Line Items]
Interest rates	1.00%
Principal Value	$ 598,000,000	636,000,000
3.875% Notes due 2025
Debt Instrument [Line Items]
Interest rates	3.875%
Principal Value	$ 229,000,000	229,000,000
3.200% Notes due 2026
Debt Instrument [Line Items]
Interest rates	3.20%
Principal Value	$ 1,750,000,000	1,750,000,000
6.800% Notes due 2026
Debt Instrument [Line Items]
Interest rates	6.80%
Principal Value	$ 256,000,000	256,000,000
Floating Rate Notes due 2026
Debt Instrument [Line Items]
Principal Value	$ 500,000,000	0
4.950% Notes due 2026
Debt Instrument [Line Items]
Interest rates	4.95%
Principal Value	$ 1,000,000,000	0
1.125% Notes due 2027
Debt Instrument [Line Items]
Interest rates	1.125%
Principal Value	$ 1,000,000,000	1,000,000,000
3.250% Notes due 2027
Debt Instrument [Line Items]
Interest rates	3.25%
Principal Value	$ 512,000,000	512,000,000
3.450% Notes due 2027
Debt Instrument [Line Items]
Interest rates	3.45%
Principal Value	$ 534,000,000	534,000,000
4.900% Notes due 2027
Debt Instrument [Line Items]
Interest rates	4.90%
Principal Value	$ 1,000,000,000	0
3.900% Notes due 2028
Debt Instrument [Line Items]
Interest rates	3.90%
Principal Value	$ 1,500,000,000	1,500,000,000
3.400% Notes due 2029
Debt Instrument [Line Items]
Interest rates	3.40%
Principal Value	$ 2,400,000,000	2,400,000,000
4.900% Notes due 2029
Debt Instrument [Line Items]
Interest rates	4.90%
Principal Value	$ 1,750,000,000	0
1.450% Notes due 2030
Debt Instrument [Line Items]
Interest rates	1.45%
Principal Value	$ 1,250,000,000	1,250,000,000
5.750% Notes due 2031
Debt Instrument [Line Items]
Interest rates	5.75%
Principal Value	$ 1,000,000,000	1,000,000,000
5.100% Notes due 2031
Debt Instrument [Line Items]
Interest rates	5.10%
Principal Value	$ 1,250,000,000	0
2.950% Notes due 2032
Debt Instrument [Line Items]
Interest rates	2.95%
Principal Value	$ 1,750,000,000	1,750,000,000
5.900% Notes due 2033
Debt Instrument [Line Items]
Interest rates	5.90%
Principal Value	$ 1,000,000,000	1,000,000,000
5.200% Notes due 2034
Debt Instrument [Line Items]
Interest rates	5.20%
Principal Value	$ 2,500,000,000	0
1.750% Euro Notes due 2035
Debt Instrument [Line Items]
Interest rates	1.75%
Principal Value	$ 598,000,000	636,000,000
5.875% Notes due 2036
Debt Instrument [Line Items]
Interest rates	5.875%
Principal Value	$ 279,000,000	279,000,000
6.125% Notes due 2038
Debt Instrument [Line Items]
Interest rates	6.125%
Principal Value	$ 219,000,000	219,000,000
4.125% Notes due 2039
Debt Instrument [Line Items]
Interest rates	4.125%
Principal Value	$ 2,000,000,000	2,000,000,000
2.350% Notes due 2040
Debt Instrument [Line Items]
Interest rates	2.35%
Principal Value	$ 750,000,000	750,000,000
5.700% Notes due 2040
Debt Instrument [Line Items]
Interest rates	5.70%
Principal Value	$ 153,000,000	153,000,000
3.550% Notes due 2042
Debt Instrument [Line Items]
Interest rates	3.55%
Principal Value	$ 1,250,000,000	1,250,000,000
3.250% Notes due 2042
Debt Instrument [Line Items]
Interest rates	3.25%
Principal Value	$ 500,000,000	500,000,000
5.250% Notes due 2043
Debt Instrument [Line Items]
Interest rates	5.25%
Principal Value	$ 226,000,000	226,000,000
4.500% Notes due 2044
Debt Instrument [Line Items]
Interest rates	4.50%
Principal Value	$ 342,000,000	342,000,000
4.625% Notes due 2044
Debt Instrument [Line Items]
Interest rates	4.625%
Principal Value	$ 748,000,000	748,000,000
5.500% Notes due 2044
Debt Instrument [Line Items]
Interest rates	5.50%
Principal Value	$ 500,000,000	0
5.000% Notes due 2045
Debt Instrument [Line Items]
Interest rates	5.00%
Principal Value	$ 758,000,000	758,000,000
4.350% Notes due 2047
Debt Instrument [Line Items]
Interest rates	4.35%
Principal Value	$ 1,250,000,000	1,250,000,000
4.550% Notes due 2048
Debt Instrument [Line Items]
Interest rates	4.55%
Principal Value	$ 1,272,000,000	1,272,000,000
4.250% Notes due 2049
Debt Instrument [Line Items]
Interest rates	4.25%
Principal Value	$ 3,750,000,000	3,750,000,000
2.550% Notes due 2050
Debt Instrument [Line Items]
Interest rates	2.55%
Principal Value	$ 1,500,000,000	1,500,000,000
3.700% Notes due 2052
Debt Instrument [Line Items]
Interest rates	3.70%
Principal Value	$ 2,000,000,000	2,000,000,000
6.250% Notes due 2053
Debt Instrument [Line Items]
Interest rates	6.25%
Principal Value	$ 1,250,000,000	1,250,000,000
5.550% Notes due 2054
Debt Instrument [Line Items]
Interest rates	5.55%
Principal Value	$ 2,750,000,000	0
3.900% Notes due 2062
Debt Instrument [Line Items]
Interest rates	3.90%
Principal Value	$ 1,000,000,000	1,000,000,000
6.400% Notes due 2063
Debt Instrument [Line Items]
Interest rates	6.40%
Principal Value	$ 1,250,000,000	1,250,000,000
5.650% Notes due 2064
Debt Instrument [Line Items]
Interest rates	5.65%
Principal Value	$ 1,750,000,000	0
6.875% Notes due 2097
Debt Instrument [Line Items]
Interest rates	6.875%
Principal Value	$ 63,000,000	63,000,000
Interest rate swap contracts
Debt Instrument [Line Items]
Fair value of interest rate swap contracts	$ (10,000,000)	$ (11,000,000)