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DEBT AND CREDIT FACILITIES - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt, net | $ 25,193 | $ 24,987
Less: Current portion of long-term debt and other obligations, net | 3,667 | 1,798
Total Long-term debt, net | $ 21,527 | 23,189
Senior Notes | 3.70% Senior Unsecured Notes Due April 2024 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.70% |
Total debt, net | $ 1,750 | 1,750
Senior Notes | 3.50% Senior Unsecured Notes Due February 2025 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.50% |
Total debt, net | $ 1,749 | 1,749
Senior Notes | 3.65% Senior Unsecured Notes Due March 2026 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.65% |
Total debt, net | $ 2,745 | 2,744
Senior Notes | 2.95% Senior Unsecured Notes Due March 2027 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.95% |
Total debt, net | $ 1,248 | 1,248
Senior Notes | 1.20% Senior Unsecured Notes Due October 2027 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.20% |
Total debt, net | $ 748 | 747
Senior Notes | 1.65% Senior Unsecured Notes Due October 2030 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.65% |
Total debt, net | $ 995 | 994
Senior Notes | 5.25% Senior Unsecured Notes Due October 2033 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.25% |
Total debt, net | $ 992 | 992
Senior Notes | 4.60% Senior Unsecured Notes Due September 2035 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.60% |
Total debt, net | $ 993 | 993
Senior Notes | 4.00% Senior Unsecured Notes Due September 2036 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.00% |
Total debt, net | $ 743 | 743
Senior Notes | 2.60% Senior Unsecured Notes Due October 2040 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.60% |
Total debt, net | $ 988 | 988
Senior Notes | 5.65% Senior Unsecured Notes Due December 2041 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.65% |
Total debt, net | $ 996 | 996
Senior Notes | 4.80% Senior Unsecured Notes Due April 2044 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.80% |
Total debt, net | $ 1,737 | 1,737
Senior Notes | 4.50% Senior Unsecured Notes Due February 2045 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Total debt, net | $ 1,734 | 1,734
Senior Notes | 4.75% Senior Unsecured Notes Due March 2046 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.75% |
Total debt, net | $ 2,223 | 2,222
Senior Notes | 4.15% Senior Unsecured Notes Due March 2047 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.15% |
Total debt, net | $ 1,729 | 1,729
Senior Notes | 2.80% Senior Unsecured Notes Due October 2050 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.80% |
Total debt, net | $ 1,478 | 1,478
Senior Notes | 5.55% Senior Unsecured Notes Due October 2053 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.55% |
Total debt, net | $ 988 | 988
Senior Notes and Medium-Term Notes |  |
Debt Instrument [Line Items] |  |
Total senior unsecured notes | 23,838 | 23,834
Liability related to future royalties |  |
Debt Instrument [Line Items] |  |
Total debt, net | 1,157 | 1,153
Liability related to assumed financing arrangement | CymaBay |  |
Debt Instrument [Line Items] |  |
Total debt, net | $ 199 | $ 0

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