Quarterly report pursuant to Section 13 or 15(d)

Debt - TripCo Debt (Details)

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Debt - TripCo Debt (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 09, 2020
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Debt Financing        
Repayments of long term debt   $ 352    
variable prepaid forward        
Debt Financing        
Carrying amount of debt     $ 41 $ 41
variable prepaid forward | Forward Contracts        
Debt Financing        
Variable prepaid forward prepayment received $ 34      
Derivative contract term 3 years      
Accreted loan total at maturity $ 42      
Common stock pledged as collateral     2.4  
Value of common stock pledged as collateral.     $ 129