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LONG-TERM DEBT - Schedule of Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Long-term Debt      
Long-term debt, gross $ 17,936   $ 17,958
Unamortized premium, net 1,187   1,261
Debt issuance costs (64)   (73)
Net book value of debt 19,059   19,146
Long-term finance leases 593   546
Current finance leases 169   143
Total debt and finance leases 19,821   19,835
Less: current maturities of financing leases (169)   (143)
Less: current maturities of long-term debt (1,055)   (22)
Long-term debt, net $ 18,597   19,670
8.750% medium-term notes due 2023 | Medium-term Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 8.75% 8.75%  
Long-term debt, gross $ 0   22
2.900% senior notes due 2024 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 2.90%    
Long-term debt, gross $ 654   654
6.950% senior notes due 2024 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.95%    
Long-term debt, gross $ 291   291
3.450% senior notes due 2024 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 3.45%    
Long-term debt, gross $ 111   111
5.875% senior notes due 2025 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 5.875%    
Long-term debt, gross $ 606   606
3.500% senior notes due 2025 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 3.50%    
Long-term debt, gross $ 137   137
5.500% senior notes due 2025 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 5.50%    
Long-term debt, gross $ 465   465
5.550% senior notes due 2026 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 5.55%    
Long-term debt, gross $ 870   870
3.200% senior notes due 2026 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 3.20%    
Long-term debt, gross $ 182   182
3.400% senior notes due 2026 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 3.40%    
Long-term debt, gross $ 284   284
7.500% debentures due 2026 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.50%    
Long-term debt, gross $ 112   112
8.500% senior notes due 2027 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 8.50%    
Long-term debt, gross $ 489   489
3.000% senior notes due 2027 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 3.00%    
Long-term debt, gross $ 216   216
7.125% debentures due 2027 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.125%    
Long-term debt, gross $ 150   150
7.000% debentures due 2027 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.00%    
Long-term debt, gross $ 48   48
6.625% debentures due 2028 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 6.625%    
Long-term debt, gross $ 14   14
7.150% debentures due 2028 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.15%    
Long-term debt, gross $ 232   232
7.200% senior debentures due 2028 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 7.20%    
Long-term debt, gross $ 82   82
6.375% senior notes due 2028 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.375%    
Long-term debt, gross $ 578   578
7.200% debentures due 2029 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.20%    
Long-term debt, gross $ 135   135
7.950% debentures due 2029 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.95%    
Long-term debt, gross $ 116   116
8.450% senior notes due 2029 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 8.45%    
Long-term debt, gross $ 116   116
3.500% senior notes due 2029 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 3.50%    
Long-term debt, gross $ 286   $ 286
Variable rate bonds due 2030 (5.610% and 5.320% as of September 30, 2023 and December 31, 2022, respectively) | Variable Rate Bonds      
Long-term Debt      
Debt instrument, variable rate 5.61%   5.32%
Long-term debt, gross $ 68   $ 68
8.875% senior notes due 2030 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 8.875%    
Long-term debt, gross $ 1,000   1,000
6.625% senior notes due 2030 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.625%    
Long-term debt, gross $ 1,449   1,449
6.125% senior notes due 2031 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.125%    
Long-term debt, gross $ 1,143   1,143
7.500% senior notes due 2031 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 7.50%    
Long-term debt, gross $ 900   900
7.875% senior notes due 2031 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 7.875%    
Long-term debt, gross $ 500   500
6.450% senior notes due 2036 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.45%    
Long-term debt, gross $ 1,727   1,727
Zero Coupon senior notes due 2036 | Senior Notes      
Long-term Debt      
Long-term debt, gross $ 673   673
4.300% senior notes due 2039 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.30%    
Long-term debt, gross $ 247   247
7.950% senior notes due 2039 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 7.95%    
Long-term debt, gross $ 325   325
6.200% senior notes due 2040 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.20%    
Long-term debt, gross $ 737   737
4.500% senior notes due 2044 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.50%    
Long-term debt, gross $ 191   191
4.625% senior notes due 2045 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.625%    
Long-term debt, gross $ 296   296
6.600% senior notes due 2046 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 6.60%    
Long-term debt, gross $ 1,117   1,117
4.400% senior notes due 2046 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.40%    
Long-term debt, gross $ 424   424
4.100% senior notes due 2047 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.10%    
Long-term debt, gross $ 258   258
4.200% senior notes due 2048 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.20%    
Long-term debt, gross $ 304   304
4.400% senior notes due 2049 | Senior Notes      
Long-term Debt      
Debt instrument interest rate stated percentage 4.40%    
Long-term debt, gross $ 280   280
7.730% debentures due 2096 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.73%    
Long-term debt, gross $ 58   58
7.500% debentures due 2096 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.50%    
Long-term debt, gross $ 60   60
7.250% debentures due 2096 | Debentures      
Long-term Debt      
Debt instrument interest rate stated percentage 7.25%    
Long-term debt, gross $ 5   $ 5