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DEBT AND CREDIT FACILITIES - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
May 31, 2019
Debt Instrument [Line Items]      
Total debt $ 17,660 $ 6,192  
Short-term debt (301) 0  
Current maturities of long-term debt and finance lease obligations (210) (406)  
Long-term debt and finance lease obligations $ 17,149 5,786  
Commercial paper      
Debt Instrument [Line Items]      
Effective interest rate 0.30%    
Total debt $ 300 0  
1.7% notes due 2021      
Debt Instrument [Line Items]      
Senior notes, coupon rates 1.70%    
Effective interest rate 1.90%    
Total debt $ 0 400  
2.4% notes due 2022      
Debt Instrument [Line Items]      
Senior notes, coupon rates 2.40%    
Effective interest rate 2.50%    
Total debt $ 203 203  
0.868% notes due 2023      
Debt Instrument [Line Items]      
Senior notes, coupon rates 0.868%    
Effective interest rate 1.20%    
Total debt $ 797 0  
Floating-rate notes due 2023      
Debt Instrument [Line Items]      
Effective interest rate 1.90%    
Total debt $ 298 0  
0.4% notes due 2024      
Debt Instrument [Line Items]      
Senior notes, coupon rates 0.40%   0.40%
Effective interest rate 0.60%    
Total debt $ 846 915  
1.322% notes due 2024      
Debt Instrument [Line Items]      
Senior notes, coupon rates 1.322%    
Effective interest rate 1.70%    
Total debt $ 1,393 0  
7.0% notes due 2024      
Debt Instrument [Line Items]      
Senior notes, coupon rates 7.00%    
Effective interest rate 7.00%    
Total debt $ 13 0  
Floating-rate notes due 2024      
Debt Instrument [Line Items]      
Effective interest rate 0.90%    
Total debt $ 298 0  
Term loan due 2024      
Debt Instrument [Line Items]      
Effective interest rate 1.80%    
Total debt $ 1,998 0  
1.3% notes due in 2025      
Debt Instrument [Line Items]      
Senior notes, coupon rates 1.30%    
Effective interest rate 1.40%    
Total debt $ 678 734  
2.6% notes due 2026      
Debt Instrument [Line Items]      
Senior notes, coupon rates 2.60%    
Effective interest rate 2.70%    
Total debt $ 747 746  
Term loan due 2026      
Debt Instrument [Line Items]      
Effective interest rate 1.90%    
Total debt $ 1,998 0  
7.65% debentures due 2027      
Debt Instrument [Line Items]      
Senior notes, coupon rates 7.65%    
Effective interest rate 7.70%    
Total debt $ 5 5  
1.915% notes due 2027      
Debt Instrument [Line Items]      
Senior notes, coupon rates 1.915%    
Effective interest rate 2.20%    
Total debt $ 1,441 0  
6.625% debentures due 2028      
Debt Instrument [Line Items]      
Senior notes, coupon rates 6.625%    
Effective interest rate 5.60%    
Total debt $ 96 97  
2.272% notes due 2028      
Debt Instrument [Line Items]      
Senior notes, coupon rates 2.272%    
Effective interest rate 2.50%    
Total debt $ 1,241 0  
1.3% notes due 2029      
Debt Instrument [Line Items]      
Senior notes, coupon rates 1.30%   1.30%
Effective interest rate 1.40%    
Total debt $ 841 912  
3.95% notes due 2030      
Debt Instrument [Line Items]      
Senior notes, coupon rates 3.95%    
Effective interest rate 4.00%    
Total debt $ 495 495  
1.73% notes due 2031      
Debt Instrument [Line Items]      
Senior notes, coupon rates 1.73%    
Effective interest rate 3.20%    
Total debt $ 644 644  
2.539% notes due 2032      
Debt Instrument [Line Items]      
Senior notes, coupon rates 2.539%    
Effective interest rate 2.70%    
Total debt $ 1,537 0  
6.25% notes due 2037      
Debt Instrument [Line Items]      
Senior notes, coupon rates 6.25%    
Effective interest rate 6.30%    
Total debt $ 265 265  
3.65% notes due 2042      
Debt Instrument [Line Items]      
Senior notes, coupon rates 3.65%    
Effective interest rate 3.70%    
Total debt $ 6 6  
4.5% notes due 2043      
Debt Instrument [Line Items]      
Senior notes, coupon rates 4.50%    
Effective interest rate 4.60%    
Total debt $ 256 256  
3.5% notes due 2046      
Debt Instrument [Line Items]      
Senior notes, coupon rates 3.50%    
Effective interest rate 3.60%    
Total debt $ 441 440  
3.132% notes due 2051      
Debt Instrument [Line Items]      
Senior notes, coupon rates 3.132%    
Effective interest rate 3.20%    
Total debt $ 742 0  
Finance leases and other      
Debt Instrument [Line Items]      
Effective interest rate 9.30%    
Total debt $ 81 $ 74