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Summary of Significant Accounting Policies - Liquidity (Details) - USD ($)
shares in Millions
3 Months Ended 18 Months Ended
Oct. 02, 2020
Jun. 30, 2020
Sep. 30, 2021
Jul. 01, 2021
Mar. 31, 2021
Oct. 01, 2020
Sep. 21, 2018
Debt Instrument [Line Items]              
Stock sold during period, net proceeds   $ 1,059,000,000          
Senior Unsecured Notes Effective September 2018 | Senior Notes              
Debt Instrument [Line Items]              
Debt issued, aggregate principal amount     $ 2,500,000,000       $ 350,000,000
Repayment of debt $ 627,000,000            
Floor Plan Facility | Line of Credit              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity     1,750,000,000 $ 1,750,000,000   $ 1,250,000,000  
MPSA | Consumer Loan              
Debt Instrument [Line Items]              
Commitment of purchaser, current availability financing, principal balances of finance receivables (up to)         $ 4,000,000,000    
Receivable purchase agreement, remaining unused capacity     2,300,000,000        
Equity Offering              
Debt Instrument [Line Items]              
Stock sold during period, net proceeds     $ 1,100,000,000        
Class A Common Stock | Equity Offering              
Debt Instrument [Line Items]              
Sale of stock, number of shares issued in transaction (in shares)     18