Fair Value Measurement of Assets and Liabilities - Quantitative Information About Level 3 Warrants,Significant Inputs (Details) - Significant Unobservable Inputs (Level 3) - Recurring $ in Millions	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Probability of vesting | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant, measurement input	0.000
Probability of vesting | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant, measurement input	0.550
Probability of vesting | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant, measurement input	0.50
Equity volatility | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant, measurement input	0.42
Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, fair value	$ 329	$ 444	$ 1,051