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Long-term Debt and Finance Leases - Issuance of Convertible Senior Notes (Details) - Convertible Senior Notes Due 2048 - Recourse Debt $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items] |  |
Conversion price per common share (in usd per share) | $ / shares | $ 44.89 | $ 46.24
Conversion ratio | 0.0222761 | 0.0216242
Carrying amount of equity component | $ | $ 518 | $ 503

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