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Debt - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2022
May 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Long-term and short-term, combined amount, gross $ 16,208   $ 17,766
Finance leases 1,284   1,261
Net unamortized premiums, discounts and debt issuance costs (521)   907
Total debt 16,971   19,934
Short-term debt (676)   (1,200)
Long-term debt $ 16,295   18,734
2.4% Notes due 2022 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 2.40%    
Long-term and short-term, combined amount, gross $ 329   329
7.65% Debentures due 2023 | Debentures      
Debt Instrument [Line Items]      
Stated interest rate 7.65%    
Long-term and short-term, combined amount, gross $ 78   78
3.35% Notes due 2024 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 3.35%    
Long-term and short-term, combined amount, gross $ 426   426
2.125% Notes due 2024 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 2.125%    
Long-term and short-term, combined amount, gross $ 900   0
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
2.4% Notes due 2025 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 2.40%    
Long-term and short-term, combined amount, gross $ 900   0
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
4.95% Notes due 2026 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 4.95% 4.95%  
Long-term and short-term, combined amount, gross $ 0   1,250
7.8% Debentures due 2027 | Notes Payable to Banks      
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%    
Long-term and short-term, combined amount, gross $ 196   1,000
4.3% Notes due 2028 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 4.30%    
Long-term and short-term, combined amount, gross $ 223   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% Debentures due 2029 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 7.00%    
7% Debentures due 2029 | Debentures      
Debt Instrument [Line Items]      
Stated interest rate 7.00%    
Long-term and short-term, combined amount, gross $ 112   200
6.95% Notes due 2029 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 6.95%    
Long-term and short-term, combined amount, gross $ 1,195   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
7.4% Notes due 2031 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 7.40%    
Long-term and short-term, combined amount, gross $ 382   500
7.25% Notes due 2031 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 7.25%    
Long-term and short-term, combined amount, gross $ 400   500
7.2% Notes due 2031 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 7.20%    
Long-term and short-term, combined amount, gross $ 447   575
2.4% Notes due 2031 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 2.40%    
Long-term and short-term, combined amount, gross $ 227   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
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%    
Long-term and short-term, combined amount, gross $ 326   500
5.951% Notes due 2037 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 5.951%    
Long-term and short-term, combined amount, gross $ 645   645
5.9% Notes due 2038 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 5.90%    
Long-term and short-term, combined amount, gross $ 350   600
6.5% Notes due 2039 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 6.50%    
Long-term and short-term, combined amount, gross $ 1,588   2,750
3.758% Notes due 2042 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 3.758%    
Long-term and short-term, combined amount, gross $ 785   0
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%    
Long-term and short-term, combined amount, gross $ 329   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%    
Long-term and short-term, combined amount, gross $ 319   800
4.85% Notes due 2048 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 4.85%    
Long-term and short-term, combined amount, gross $ 219   600
3.8% Notes due 2052 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 3.80%    
Long-term and short-term, combined amount, gross $ 1,100   0
4.025% Notes due 2062 | Notes Payable to Banks      
Debt Instrument [Line Items]      
Stated interest rate 4.025%    
Long-term and short-term, combined amount, gross $ 1,770   0
Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% –1.12% during 2021 | Floating Rate Notes      
Debt Instrument [Line Items]      
Long-term and short-term, combined amount, gross $ 0   $ 500
Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% –1.12% during 2021 | Floating Rate Notes | Minimum      
Debt Instrument [Line Items]      
Stated interest rate 1.06%   1.02%
Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% –1.12% during 2021 | Floating Rate Notes | Maximum      
Debt Instrument [Line Items]      
Stated interest rate 1.41%   1.12%
Marine Terminal Revenue Refunding Bonds due 2031 at 0.07% – 1.09% during 2022 and 0.04% – 0.15% during 2021 | 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 0.07% – 1.09% during 2022 and 0.04% – 0.15% during 2021 | Variable Rate Debt Bonds | Minimum      
Debt Instrument [Line Items]      
Stated interest rate 0.07%   0.04%
Marine Terminal Revenue Refunding Bonds due 2031 at 0.07% – 1.09% during 2022 and 0.04% – 0.15% during 2021 | Variable Rate Debt Bonds | Maximum      
Debt Instrument [Line Items]      
Stated interest rate 1.09%   0.15%
Industrial Development Bonds due 2035 at 0.07% – 1.09% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds      
Debt Instrument [Line Items]      
Long-term and short-term, combined amount, gross $ 18   $ 18
Industrial Development Bonds due 2035 at 0.07% – 1.09% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds | Minimum      
Debt Instrument [Line Items]      
Stated interest rate 0.07%   0.04%
Industrial Development Bonds due 2035 at 0.07% – 1.09% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds | Maximum      
Debt Instrument [Line Items]      
Stated interest rate 1.09%   0.12%
Other      
Debt Instrument [Line Items]      
Long-term and short-term, combined amount, gross $ 33   $ 35