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LONG-TERM DEBT - DEBT ISSUANCE, REPURCHASES, REPAYMENTS AND EXCHANGES (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 20, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2020
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Total borrowings at face value as of December 31, 2020 |  |  |  | $ 35,235,000,000 |  | $ 37,401,000,000
Total borrowings at face value as of December 31, 2021 |  | $ 28,493,000,000 |  |  | $ 35,235,000,000 | 35,235,000,000
Variable rate bonds due 2021 | First quarter repayments |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  | (27,000,000) |  |
Variable rate bonds due 2021 | July tender and purchase |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | (473,000,000)
Variable rate bonds due 2021 | August and September tender and purchase |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | (123,000,000)
Variable rate bonds due August 2022 | August and September tender and purchase |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (448,000,000)
6.500% note payable to WES due 2038 | August WES exchange | WES |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.50% | 6.50%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (260,000,000)
2-year variable rate term loan due 2021 |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  | $ (2,500,000,000) |
2-year variable rate term loan due 2021 | September repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (500,000,000)
2-year variable rate bonds due August 2021 | October repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (377,000,000)
2-year variable rate term loan due September 2021 | October repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (1,010,000,000)
2-year variable rate term loan due September 2021 | November repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (232,000,000)
2-year variable rate term loan due September 2021 | December repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 2 years
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (214,000,000)
Senior notes |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Total borrowings at face value as of December 31, 2020 |  |  |  | $ 7,000,000,000 |  |
Total borrowings at face value as of December 31, 2021 |  |  |  |  | 7,000,000,000 | $ 7,000,000,000
Senior notes | 4.850% senior notes due 2021 | First quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 4.85% |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  | $ (147,000,000) |  |
Senior notes | 2.700% senior notes due 2022 |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  | (2,700,000,000) |
Senior notes | 2.700% senior notes due 2022 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.70% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (278,000,000) |  |  |
Senior notes | 2.700% senior notes due 2022 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (627,000,000) |  |  |  |
Senior notes | 2.700% senior notes due 2023 |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  | $ (264,000,000) |
Senior notes | 2.700% senior notes due 2023 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.70% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (484,000,000) |  |  |
Senior notes | 3.450% senior notes due 2024 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.45% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (81,000,000) |  |  |
Senior notes | 3.450% senior notes due 2024 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.45% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (40,000,000) |  |  |  |
Senior notes | 2.900% senior notes due 2024 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.90% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (1,620,000,000) |  |  |
Senior notes | 2.900% senior notes due 2024 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 2.90% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (431,000,000) |  |  |  |
Senior notes | 3.500% senior notes due 2025 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.50% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (229,000,000) |  |  |
Senior notes | 3.500% senior notes due 2025 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.50% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (195,000,000) |  |  |  |
Senior notes | 3.400% senior notes due 2026 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.40% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (224,000,000) |  |  |
Senior notes | 3.400% senior notes due 2026 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.40% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (148,000,000) |  |  |  |
Senior notes | 3.200% senior notes due 2026 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 3.20% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (110,000,000) |  |  |
Senior notes | 3.200% senior notes due 2026 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.20% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (93,000,000) |  |  |  |
Senior notes | 2.600% senior notes due 2021 | Third quarter repayments |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 2.60% |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (224,000,000) |  |  |
Senior notes | Floating interest rate notes due August 2022 | Third quarter repayments |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  | $ (1,051,000,000) |  |  |
Senior notes | 4.400% senior notes due 2046 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.40% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (224,000,000) |  |  |  |
Senior notes | 4.400% senior notes due 2049 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.40% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (46,000,000) |  |  |  |
Senior notes | 7.730% debentures due 2096 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 7.73% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (3,000,000) |  |  |  |
Senior notes | 7.500% debentures due 2026 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 7.50% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (18,000,000) |  |  |  |
Senior notes | 7.250% debentures due 2096 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 7.25% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (44,000,000) |  |  |  |
Senior notes | 6.600% senior notes due 2046 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage | 6.60% | 6.60% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances | $ 57,200,000 | $ 57,000,000 |  |  |  |
Senior notes | 3.000% senior notes due 2027 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.00% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (116,000,000) |  |  |  |
Senior notes | 3.500% senior notes due 2029 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.50% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (23,000,000) |  |  |  |
Senior notes | 4.100% senior notes due 2047 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.10% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (87,000,000) |  |  |  |
Senior notes | 4.200% senior notes due 2048 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.20% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (39,000,000) |  |  |  |
Senior notes | 4.300% senior notes due 2039 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.30% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (57,000,000) |  |  |  |
Senior notes | 4.500% senior notes due 2044 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.50% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (17,000,000) |  |  |  |
Senior notes | 4.625% senior notes due 2045 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.625% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (116,000,000) |  |  |  |
Senior notes | 3.125% senior notes due 2022 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.125% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (276,000,000) |  |  |  |
Senior notes | 2.700% senior notes due 2022 | Fourth quarter issuances (repayments) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 2.70% |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  | $ (351,000,000) |  |  |  |
Senior notes | 8.000% senior notes due 2025 | Issuance of July 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 8.00% | 8.00%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 500,000,000
Senior notes | 8.500% senior notes due 2027 | Issuance of July 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 8.50% | 8.50%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 500,000,000
Senior notes | 8.875% senior notes due 2030 | Issuance of July 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 8.875% | 8.875%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 1,000,000,000
Senior notes | 4.100% senior notes due February 2021 | July tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.10% | 4.10%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (943,000,000)
Senior notes | 4.100% senior notes due February 2021 | August and September tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.10% | 4.10%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (139,000,000)
Senior notes | 4.100% senior notes due February 2021 | December repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.10% | 4.10%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (167,000,000)
Senior notes | 4.850% senior notes due March 2021 | July tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.85% | 4.85%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (530,000,000)
Senior notes | 2.600% senior notes due August 2021 | July tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (51,000,000)
Senior notes | 2.600% senior notes due August 2021 | August and September tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (1,099,000,000)
Senior notes | 2.600% senior notes due August 2021 | December tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (126,000,000)
Senior notes | 5.875% senior notes due 2025 | Issuance of August 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 5.875% | 5.875%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 900,000,000
Senior notes | 6.375% senior notes due 2028 | Issuance of August 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.375% | 6.375%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 600,000,000
Senior notes | 6.625% senior notes due 2030 | Issuance of August 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.625% | 6.625%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 1,500,000,000
Senior notes | 2.600% senior notes due April 2022 | August and September tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (171,000,000)
Senior notes | 2.600% senior notes due April 2022 | December tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.60% | 2.60%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (128,000,000)
Senior notes | 2.700% senior notes due August 2022 | August and September tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (102,000,000)
Senior notes | 2.700% senior notes due August 2022 | December tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (1,269,000,000)
Senior notes | 2.700% senior notes due February 2023 | August and September tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (52,000,000)
Senior notes | 2.700% senior notes due February 2023 | December tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.70% | 2.70%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (212,000,000)
Senior notes | 0.00% senior notes due October 2036 |  |  |  |  |  |
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  | $ (2,000,000) |
Senior notes | 0.00% senior notes due October 2036 | October repayment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 0.00% | 0.00%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (2,000,000)
Senior notes | 5.500% senior notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 5.50% |  |  | 5.50% | 5.50%
Senior notes | 5.500% senior notes due 2025 | Issuance of December 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 5.50% | 5.50%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 750,000,000
Senior notes | 6.125% senior notes due 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 6.125% |  |  | 6.125% | 6.125%
Senior notes | 6.125% senior notes due 2031 | Issuance of December 2020 notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 6.125% | 6.125%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Issuances |  |  |  |  |  | $ 1,250,000,000
Senior notes | 3.125% senior notes due February 2022 | December tender and purchase |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 3.125% | 3.125%
Long-term Debt Rollforward [Roll Forward] |  |  |  |  |  |
Tender, purchase and repayments |  |  |  |  |  | $ (538,000,000)

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