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Long-term Debt and Finance Leases - Schedule of Long-term Debt and Finance Leases (Details) $ / shares in Units, $ in Millions | Oct. 29, 2021 $ / shares | Nov. 04, 2021 | Sep. 30, 2021 USD ($) | Aug. 24, 2021 | Aug. 23, 2021 | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Finance leases |  |  | $ 13 |  |  | $ 4
Subtotal long-term debt and finance leases (including current maturities) |  |  | 8,613 |  |  | 8,859
Less current maturities |  |  | (504) |  |  | (1)
Less debt issuance costs |  |  | (89) |  |  | (93)
Discounts |  |  | (63) |  |  | (74)
Total long-term debt and finance leases |  |  | 7,957 |  |  | 8,691
Senior Notes, due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 7.25% |  |
Senior Notes, due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.625% |  |
Senior Notes, due 2027 | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  | 6.625% |  |  |  |
Senior Notes, due 2032 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 3.875% |
Recourse Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | 8,600 |  |  | 8,855
Recourse Debt | Senior Notes, due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 0 |  |  | 1,000
Interest rate, stated percentage |  |  | 7.25% |  |  |
Recourse Debt | Senior Notes, due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 875 |  |  | 1,230
Interest rate, stated percentage |  |  | 6.625% |  |  |
Recourse Debt | Senior Notes, due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 821 |  |  | 821
Interest rate, stated percentage |  |  | 5.75% |  |  |
Recourse Debt | Senior Notes, due 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 733 |  |  | 733
Interest rate, stated percentage |  |  | 5.25% |  |  |
Recourse Debt | Senior Notes, due 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 500 |  |  | 500
Interest rate, stated percentage |  |  | 3.375% |  |  |
Recourse Debt | Senior Notes, due 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 1,030 |  |  | 1,030
Interest rate, stated percentage |  |  | 3.625% |  |  |
Recourse Debt | Senior Notes, due 2032 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 1,100 |  |  | 0
Interest rate, stated percentage |  |  | 3.875% |  |  |
Recourse Debt | Convertible Senior Notes Due 2048 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 575 |  |  | 575
Interest rate, stated percentage |  |  | 2.75% |  |  |
Recourse Debt | Convertible Senior Notes Due 2048 | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible Notes, conversion price (in usd per share) | $ / shares | $ 44.89 |  |  |  |  |
Conversion rate | 0.0222761 |  |  |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 600 |  |  | 600
Interest rate, stated percentage |  |  | 3.75% |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 500 |  |  | 500
Interest rate, stated percentage |  |  | 2.00% |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 900 |  |  | 900
Interest rate, stated percentage |  |  | 2.45% |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 500 |  |  | 500
Interest rate, stated percentage |  |  | 4.45% |  |  |
Recourse Debt | Tax-exempt bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subtotal long-term debt (including current maturities) |  |  | $ 466 |  |  | $ 466
Recourse Debt | Tax-exempt bonds | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  |  | 1.25% |  |  |
Recourse Debt | Tax-exempt bonds | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  |  | 4.75% |  |  |

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