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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
	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Conversion price per common share (in usd per share) | $ / shares	$ 46.24	$ 47.74
Conversion ratio	0.0216242	0.0209479
Carrying amount of equity component | $	$ 503	$ 491

X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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