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LONG-TERM DEBT - SCHEDULE (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 20, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 28,493.0 | $ 35,235.0
Unamortized premium, net |  |  | 670.0 | 748.0
Debt issuance costs |  |  | (135.0) | (156.0)
Net book value of debt |  |  | 29,028.0 | 35,827.0
Long-term finance leases |  |  | 504.0 | 316.0
Current finance leases |  |  | 85.0 | 42.0
Total debt and finance leases |  |  | 29,617.0 | 36,185.0
Less current maturities of financing leases |  |  | (85.0) | (42.0)
Less current maturities of long-term debt |  |  | (101.0) | (398.0)
Long-term debt, net | [1] |  | $ 29,431.0 | $ 35,745.0
4.850% senior notes due 2021 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.85% | 4.85%
Long-term debt, gross |  |  | $ 0.0 | $ 147.0
2.600% senior notes due 2021 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.60% | 2.60%
Long-term debt, gross |  |  | $ 0.0 | $ 224.0
Variable rate bonds due 2021 | Variable rate bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, variable rate |  |  |  | 1.193%
Long-term debt, gross |  |  | $ 0.0 | $ 27.0
2.700% senior notes due 2022 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.70% | 2.70%
Long-term debt, gross |  |  | $ 0.0 | $ 629.0
3.125% senior notes due 2022 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.125% | 3.125%
Long-term debt, gross |  |  | $ 0.0 | $ 276.0
2.600% senior notes due 2022 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.60% | 2.60%
Long-term debt, gross |  |  | $ 101.0 | $ 101.0
Variable rate bonds due 2022 | Variable rate bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, variable rate |  |  |  | 1.73%
Long-term debt, gross |  |  | $ 0.0 | $ 1,052.0
2.700% senior notes due 2023 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.70% | 2.70%
Long-term debt, gross |  |  | $ 442.0 | $ 927.0
8.750% medium-term notes due 2023 | Medium-term notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 8.75% | 8.75%
Long-term debt, gross |  |  | $ 22.0 | $ 22.0
2.900% senior notes due 2024 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.90% | 2.90%
Long-term debt, gross |  |  | $ 949.0 | $ 3,000.0
6.950% senior notes due 2024 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.95% | 6.95%
Long-term debt, gross |  |  | $ 650.0 | $ 650.0
3.450% senior notes due 2024 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.45% | 3.45%
Long-term debt, gross |  |  | $ 127.0 | $ 248.0
8.000% senior notes due 2025 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 8.00% | 8.00%
Long-term debt, gross |  |  | $ 500.0 | $ 500.0
5.875% senior notes due 2025 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 5.875% | 5.875%
Long-term debt, gross |  |  | $ 900.0 | $ 900.0
3.500% senior notes due 2025 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.50% | 3.50%
Long-term debt, gross |  |  | $ 326.0 | $ 750.0
5.500% senior notes due 2025 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 5.50% | 5.50%
Long-term debt, gross |  |  | $ 750.0 | $ 750.0
5.550% senior notes due 2026 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 5.55% | 5.55%
Long-term debt, gross |  |  | $ 1,100.0 | $ 1,100.0
3.200% senior notes due 2026 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.20% | 3.20%
Long-term debt, gross |  |  | $ 797.0 | $ 1,000.0
3.400% senior notes due 2026 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.40% | 3.40%
Long-term debt, gross |  |  | $ 779.0 | $ 1,150.0
7.500% debentures due 2026 | Senior notes | Fourth quarter issuances (repayments) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.50% |
Repayments of long-term debt |  |  | $ 18.0 |
7.500% debentures due 2026 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.50% | 7.50%
Long-term debt, gross |  |  | $ 112.0 | $ 112.0
8.500% senior notes due 2027 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 8.50% | 8.50%
Long-term debt, gross |  |  | $ 500.0 | $ 500.0
3.000% senior notes due 2027 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.00% | 3.00%
Long-term debt, gross |  |  | $ 634.0 | $ 750.0
7.125% debentures due 2027 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.125% | 7.125%
Long-term debt, gross |  |  | $ 150.0 | $ 150.0
7.000% debentures due 2027 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.00% | 7.00%
Long-term debt, gross |  |  | $ 48.0 | $ 48.0
6.625% debentures due 2028 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.625% | 6.625%
Long-term debt, gross |  |  | $ 14.0 | $ 14.0
7.150% debentures due 2028 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.15% | 7.15%
Long-term debt, gross |  |  | $ 235.0 | $ 235.0
7.200% senior debentures due 2028 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.20% | 7.20%
Long-term debt, gross |  |  | $ 82.0 | $ 82.0
6.375% senior notes due 2028 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.375% | 6.375%
Long-term debt, gross |  |  | $ 600.0 | $ 600.0
7.200% debentures due 2029 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.20% | 7.20%
Long-term debt, gross |  |  | $ 135.0 | $ 135.0
7.950% debentures due 2029 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.95% | 7.95%
Long-term debt, gross |  |  | $ 116.0 | $ 116.0
8.450% senior debentures due 2029 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 8.45% | 8.45%
Long-term debt, gross |  |  | $ 116.0 | $ 116.0
3.500% senior notes due 2029 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.50% | 3.50%
Long-term debt, gross |  |  | $ 1,477.0 | $ 1,500.0
Variable rate bonds due 2030 | Variable rate bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, variable rate |  |  | 0.90% | 2.70%
Long-term debt, gross |  |  | $ 68.0 | $ 68.0
8.875% senior notes due 2030 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 8.875% | 8.875%
Long-term debt, gross |  |  | $ 1,000.0 | $ 1,000.0
6.625% senior notes due 2030 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.625% | 6.625%
Long-term debt, gross |  |  | $ 1,500.0 | $ 1,500.0
6.125% senior notes due 2031 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.125% | 6.125%
Long-term debt, gross |  |  | $ 1,250.0 | $ 1,250.0
7.500% senior notes due 2031 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.50% | 7.50%
Long-term debt, gross |  |  | $ 900.0 | $ 900.0
7.875% senior notes due 2031 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.875% | 7.875%
Long-term debt, gross |  |  | $ 500.0 | $ 500.0
6.450% senior notes due 2036 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.45% | 6.45%
Long-term debt, gross |  |  | $ 1,750.0 | $ 1,750.0
Zero Coupon senior notes due 2036 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 5.24% |
Long-term debt, gross |  |  | $ 2,269.0 | $ 2,269.0
4.300% senior notes due 2039 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.30% | 4.30%
Long-term debt, gross |  |  | $ 693.0 | $ 750.0
7.950% senior notes due 2039 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.95% | 7.95%
Long-term debt, gross |  |  | $ 325.0 | $ 325.0
6.200% senior notes due 2040 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.20% | 6.20%
Long-term debt, gross |  |  | $ 750.0 | $ 750.0
4.500% senior notes due 2044 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.50% | 4.50%
Long-term debt, gross |  |  | $ 608.0 | $ 625.0
4.625% senior notes due 2045 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.625% | 4.625%
Long-term debt, gross |  |  | $ 634.0 | $ 750.0
6.600% senior notes due 2046 (a) | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.60% | 6.60%
Long-term debt, gross |  |  | $ 1,157.0 | $ 1,100.0
4.400% senior notes due 2046 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.40% | 4.40%
Long-term debt, gross |  |  | $ 976.0 | $ 1,200.0
4.100% senior notes due 2047 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.10% | 4.10%
Long-term debt, gross |  |  | $ 663.0 | $ 750.0
4.200% senior notes due 2048 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.20% | 4.20%
Long-term debt, gross |  |  | $ 961.0 | $ 1,000.0
4.400% senior notes due 2049 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.40% | 4.40%
Long-term debt, gross |  |  | $ 704.0 | $ 750.0
7.730% debentures due 2096 | Senior notes | Fourth quarter issuances (repayments) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.73% |
Repayments of long-term debt |  |  | $ 3.0 |
7.730% debentures due 2096 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.73% | 7.73%
Long-term debt, gross |  |  | $ 58.0 | $ 60.0
7.500% debentures due 2096 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.50% | 7.50%
Long-term debt, gross |  |  | $ 60.0 | $ 78.0
7.250% debentures due 2096 | Senior notes | Fourth quarter issuances (repayments) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.25% |
Repayments of long-term debt |  |  | $ 44.0 |
7.250% debentures due 2096 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  |  | 7.25% | 7.25%
Long-term debt, gross |  |  | $ 5.0 | $ 49.0
6.600% senior notes due 2046 | Senior notes | Fourth quarter issuances (repayments) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage |  | 6.60% | 6.60% |
Proceeds from issuances |  | $ 57.2 | $ 57.0 |
Debentures Due 2096 | Senior notes | Fourth quarter issuances (repayments) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  | $ 64.8 |  |
[1] | Included $504 million and $316 million of finance lease liabilities as of December 31, 2021, and 2020, respectively.

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