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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]        
Finance leases $ 1,320     $ 1,261
Net unamortized premiums, discounts and debt issuance costs 532     (907)
Total debt 16,643     19,934
Short-term debt (417)     (1,200)
Long-term debt $ 16,226     18,734
2.40% Notes due 2022 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 2.40%      
Long-term and short-term, combined amount, gross $ 0     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%   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
2.40% Notes due 2025 | Notes Payable to Banks        
Debt Instrument [Line Items]        
Stated interest rate 2.40%   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 | 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%      
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
7.0% 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 $ 631     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%   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% – 4.10% 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% – 4.10% 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% – 4.10% during 2022 and 0.04% – 0.15% during 2021 | Variable Rate Debt Bonds | Maximum        
Debt Instrument [Line Items]        
Stated interest rate 4.10%     0.15%
Industrial Development Bonds due 2035 at 0.07% – 4.10% 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% – 4.10% 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% – 4.10% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds | Maximum        
Debt Instrument [Line Items]        
Stated interest rate 4.10%     0.12%
Other        
Debt Instrument [Line Items]        
Long-term and short-term, combined amount, gross $ 23     $ 35