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Long-term Debt and Finance Leases - Schedule of Long-term Debt and Finance Leases (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2022 $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Aug. 24, 2021 | Aug. 23, 2021 | Dec. 02, 2020 | May 24, 2019 | Dec. 07, 2017 | Aug. 02, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 8,100 | $ 8,855 |  |  |  |  |  |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  | Total long-term debt and finance leases | Total long-term debt and finance leases |  |  |  |  |  |
Finance leases |  | $ 13 | $ 4 |  |  |  |  |  |
Total long-term debt and finance lease obligations |  | 8,113 | 8,859 |  |  |  |  |  |
Less current maturities |  | (4) | (1) |  |  |  |  |  |
Less debt issuance costs |  | (83) | (93) |  |  |  |  |  |
Discounts |  | (60) | (74) |  |  |  |  |  |
Total long-term debt and finance leases |  | 7,966 | 8,691 |  |  |  |  |  |
Debt Instrument, Unamortized Discount [Abstract] |  |  |  |  |  |  |  |  |
Total discounts |  | $ (60) | (74) |  |  |  |  |  |
Senior Notes, due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 7.25% |  | 7.25% |  |  |  |  |
Senior Notes, due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 6.625% |  | 6.625% |  |  |  |  |
Senior Notes, due 2032 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  | 3.875% |  |  | 3.875% |  |  |  |
Tax-exempt bonds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 466 | 466 |  |  |  |  |  |
Recourse Debt | Senior Notes, due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 0 | 1,000 |  |  |  |  |  |
Interest rate, stated percentage |  | 7.25% |  |  |  |  |  |  |
Recourse Debt | Senior Notes, due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 375 | 1,230 |  |  |  |  |  |
Interest rate, stated percentage |  | 6.625% |  |  |  |  |  |  | 6.625%
Recourse Debt | Senior Notes, due 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 821 | 821 |  |  |  |  |  |
Interest rate, stated percentage |  | 5.75% |  |  |  |  |  | 5.75% |
Recourse Debt | Senior Notes, due 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 733 | 733 |  |  |  |  |  |
Interest rate, stated percentage |  | 5.25% |  |  |  |  | 5.25% |  |
Recourse Debt | Senior Notes, due 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 500 | 500 |  |  |  |  |  |
Interest rate, stated percentage |  | 3.375% |  |  |  | 3.375% |  |  |
Recourse Debt | Senior Notes, due 2031 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 1,030 | 1,030 |  |  |  |  |  |
Interest rate, stated percentage |  | 3.625% |  |  |  | 3.625% |  |  |
Recourse Debt | Senior Notes, due 2032 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 1,100 | 0 |  |  |  |  |  |
Interest rate, stated percentage |  | 3.875% |  |  |  |  |  |  |
Recourse Debt | Convertible Senior Notes Due 2048 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 575 | 575 |  |  |  |  |  |
Discounts |  | $ (58) | $ (72) |  |  |  |  |  |
Interest rate, stated percentage |  | 2.75% |  |  |  |  |  |  |
Effective rate |  | 5.34% | 5.19% |  |  |  |  |  |
Conversion price per common share (in usd per share) | $ / shares |  | $ 44.89 | $ 46.24 |  |  |  |  |  |
Conversion ratio |  | 0.0222761 | 0.0216242 |  |  |  |  |  |
Debt Instrument, Unamortized Discount [Abstract] |  |  |  |  |  |  |  |  |
Total discounts |  | $ (58) | $ (72) |  |  |  |  |  |
Recourse Debt | Convertible Senior Notes Due 2048 | Subsequent Event |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Conversion price per common share (in usd per share) | $ / shares | $ 44.53 |  |  |  |  |  |  |  |
Conversion ratio | 0.0224563 |  |  |  |  |  |  |  |
Debt discount amortization period | 3 years 8 months 12 days |  |  |  |  |  |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 600 | 600 |  |  |  |  |  |
Interest rate, stated percentage |  | 3.75% |  |  |  |  |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 500 | 500 |  |  |  |  |  |
Interest rate, stated percentage |  | 2.00% |  |  |  | 2.00% |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 900 | 900 |  |  |  |  |  |
Interest rate, stated percentage |  | 2.45% |  |  |  | 2.45% |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 500 | 500 |  |  |  |  |  |
Interest rate, stated percentage |  | 4.45% |  |  |  |  |  |  |
Recourse Debt | Tax-exempt bonds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 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% |  |  |  |  |  |  |
Recourse Debt | Senior Secured First Lien Notes, due 2024, 2025, 2027 and 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Discounts |  | $ (2) | (2) |  |  |  |  |  |
Debt Instrument, Unamortized Discount [Abstract] |  |  |  |  |  |  |  |  |
Total discounts |  | $ (2) | $ (2) |  |  |  |  |  |

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