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Long-term Debt and Finance Leases - Senior Notes (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Discount amortization period	7 years
Adjustment for adoption of new accounting guidance	$ 5,030		$ 3,600	$ 1,517	$ 1,680
Additional Paid-In Capital
Debt Instrument [Line Items]
Adjustment for adoption of new accounting guidance	8,433		8,531	8,513	8,517
Retained Earnings
Debt Instrument [Line Items]
Adjustment for adoption of new accounting guidance	$ 2,171		464	$ (1,565)	$ (1,403)
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Adjustment for adoption of new accounting guidance			(43)
Debt discount		$ 57
Deferred tax liabilities		14
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital
Debt Instrument [Line Items]
Adjustment for adoption of new accounting guidance		(100)	(100)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Debt Instrument [Line Items]
Adjustment for adoption of new accounting guidance		$ 57	$ 57
Recourse Debt | Convertible Senior Notes Due 2048
Debt Instrument [Line Items]
Convertible notes, conversion price (in usd per share)	$ 44.53

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