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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2023
May 25, 2023
Dec. 31, 2022
Mar. 31, 2022
Debt Instrument [Line Items]        
Finance leases $ 1,129   $ 1,320  
Net unamortized premiums, discounts and debt issuance costs (605)   (532)  
Total debt 18,937   16,643  
Short-term debt (1,074)   (417)  
Long-term debt 17,863   16,226  
Debt at face value 18,413   15,855  
Variable Rate Debt Bonds        
Debt Instrument [Line Items]        
Debt at face value $ 283   283  
7.65% Debentures due 2023 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 7.65%      
7.65% Debentures due 2023 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 7.65%      
Long-term and short-term, combined amount, gross $ 0   78  
2.125% Notes due 2024 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 2.125% 2.125%   2.125%
Long-term and short-term, combined amount, gross $ 461   900  
Debt at face value   $ 900   $ 900
3.35% Notes due 2024 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 3.35% 3.35%    
Long-term and short-term, combined amount, gross $ 265   426  
Debt at face value   $ 426    
2.4% Notes due 2025 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 2.40% 2.40%   2.40%
Long-term and short-term, combined amount, gross $ 366   900  
Debt at face value   $ 900   $ 900
8.2% Notes due 2025 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 8.20%      
Long-term and short-term, combined amount, gross $ 134   134  
3.35% Debentures due 2025 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 3.35%      
Long-term and short-term, combined amount, gross $ 199   199  
6.875% Debentures due 2026 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 6.875%      
Long-term and short-term, combined amount, gross $ 67   67  
7.8% Debentures due 2027 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 7.80%      
Long-term and short-term, combined amount, gross $ 203   203  
3.75% Notes due 2027 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 3.75%     3.75%
Long-term and short-term, combined amount, gross $ 196   196  
Debt at face value       $ 1,000
4.3% Notes due 2028 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 4.30%     4.30%
Long-term and short-term, combined amount, gross $ 223   223  
Debt at face value       $ 1,000
7.375% Debentures due 2029 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 7.375%      
Long-term and short-term, combined amount, gross $ 92   92  
7.0% Debentures due 2029 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 7.00%     7.00%
Long-term and short-term, combined amount, gross $ 112   112  
Debt at face value       $ 200
6.95% Notes due 2029 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 6.95%     6.95%
Long-term and short-term, combined amount, gross $ 1,195   1,195  
Debt at face value       $ 1,549
8.125% Notes due 2030 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 8.125%      
Long-term and short-term, combined amount, gross $ 390   390  
2.4% Notes due 2031 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 2.40%     2.40%
Long-term and short-term, combined amount, gross $ 227   227  
Debt at face value       $ 500
7.2% Notes due 2031 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 7.20%     7.20%
Long-term and short-term, combined amount, gross $ 447   447  
Debt at face value       $ 575
7.25% Notes due 2031 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 7.25%     7.25%
Long-term and short-term, combined amount, gross $ 400   400  
Debt at face value       $ 500
7.4% Notes due 2031 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 7.40%     7.40%
Long-term and short-term, combined amount, gross $ 382   382  
Debt at face value       $ 500
5.9% Notes due 2032 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.90%      
Long-term and short-term, combined amount, gross $ 505   505  
5.05% Notes due 2033 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.05%      
Long-term and short-term, combined amount, gross $ 1,000   0  
4.15% Notes due 2034 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 4.15%      
Long-term and short-term, combined amount, gross $ 246   246  
5.95% Notes due 2036 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.95%     5.95%
Long-term and short-term, combined amount, gross $ 326   326  
Debt at face value       $ 500
5.951% Notes serially maturing 2022 through 2037 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.951%      
Long-term and short-term, combined amount, gross $ 603   631  
5.9% Notes due 2038 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.90%     5.90%
Long-term and short-term, combined amount, gross $ 350   350  
Debt at face value       $ 600
6.5% Notes due 2039 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 6.50%     6.50%
Long-term and short-term, combined amount, gross $ 1,588   1,588  
Debt at face value       $ 2,750
3.758% Notes due 2042 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 3.758%     3.758%
Long-term and short-term, combined amount, gross $ 785   785  
Debt at face value       $ 785
4.3% Notes due 2044 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 4.30%      
Long-term and short-term, combined amount, gross $ 750   750  
5.95% Notes due 2046 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.95%     5.95%
Long-term and short-term, combined amount, gross $ 329   329  
Debt at face value       $ 500
7.9% Debentures due 2047 | Debentures        
Debt Instrument [Line Items]        
Stated interest rate 7.90%      
Long-term and short-term, combined amount, gross $ 60   60  
4.875% Notes due 2047 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 4.875%     4.875%
Long-term and short-term, combined amount, gross $ 319   319  
Debt at face value       $ 800
4.85% Notes due 2048 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 4.85%     4.85%
Long-term and short-term, combined amount, gross $ 219   219  
Debt at face value       $ 600
3.8% Notes due 2052 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 3.80%     3.80%
Long-term and short-term, combined amount, gross $ 1,100   1,100  
Debt at face value       $ 1,100
5.3% Notes due 2053 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.30%      
Long-term and short-term, combined amount, gross $ 1,100   0  
5.55% Notes due 2054 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.55%      
Long-term and short-term, combined amount, gross $ 1,000   0  
4.025% Notes due 2062 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 4.025%     4.025%
Long-term and short-term, combined amount, gross $ 1,770   1,770  
Debt at face value       $ 1,770
5.70% Notes due 2063 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 5.70%      
Long-term and short-term, combined amount, gross $ 700   0  
Marine Terminal Revenue Refunding Bonds due 2031 at 1.65% – 4.70% during 2023 and 0.07% – 4.10% during 2022 | Variable Rate Debt Bonds        
Debt Instrument [Line Items]        
Long-term and short-term, combined amount, gross $ 265   $ 265  
Marine Terminal Revenue Refunding Bonds due 2031 at 1.65% – 4.70% during 2023 and 0.07% – 4.10% during 2022 | Variable Rate Debt Bonds | Minimum        
Debt Instrument [Line Items]        
Stated interest rate 1.65%   0.07%  
Marine Terminal Revenue Refunding Bonds due 2031 at 1.65% – 4.70% during 2023 and 0.07% – 4.10% during 2022 | Variable Rate Debt Bonds | Maximum        
Debt Instrument [Line Items]        
Stated interest rate 4.70%   4.10%  
Industrial Development Bonds due 2035 at 1.85% – 4.70% during 2023 and 0.07% – 4.10% during 2022 | Variable Rate Debt Bonds        
Debt Instrument [Line Items]        
Long-term and short-term, combined amount, gross $ 18   $ 18  
Industrial Development Bonds due 2035 at 1.85% – 4.70% during 2023 and 0.07% – 4.10% during 2022 | Variable Rate Debt Bonds | Minimum        
Debt Instrument [Line Items]        
Stated interest rate 1.85%   0.07%  
Industrial Development Bonds due 2035 at 1.85% – 4.70% during 2023 and 0.07% – 4.10% during 2022 | Variable Rate Debt Bonds | Maximum        
Debt Instrument [Line Items]        
Stated interest rate 4.70%   4.10%  
Other        
Debt Instrument [Line Items]        
Long-term and short-term, combined amount, gross $ 21   $ 23