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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue The following table provides the revenues recognized by revenue source for the three and nine months ended September 30, 2021 and 2020 (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Passenger revenue
Passenger travel$1,773 $420 $3,717 $1,973 
Loyalty revenue - air transportation83 25 196 153 
Other revenue
Loyalty revenue80 38 206 127 
Other revenue36 9 84 42 
Total revenue$1,972 $492 $4,203 $2,295 
Schedule of Contract Liabilities
Our contract liabilities primarily consist of ticket sales for which transportation has not yet been provided, unused credits available to customers, and outstanding loyalty points available for redemption (in millions):
September 30, 2021December 31, 2020
Air traffic liability - passenger travel$1,416 $964 
Air traffic liability - loyalty program and deferred revenue1,473 825 
Total$2,889 $1,789 
The table below presents the activity of the current and non-current air traffic liability for our loyalty program, and includes points earned and sold to participating companies for the nine months ended September 30, 2021 and 2020 (in millions):
Balance at December 31, 2020$733 
TrueBlue® points redeemed
(196)
TrueBlue® points earned and sold
308 
Balance at September 30, 2021$845 
Balance at December 31, 2019$661 
TrueBlue® points redeemed
(153)
TrueBlue® points earned and sold
195 
Balance at September 30, 2020$703 
The timing of our TrueBlue® point redemptions can vary; however, the majority of our points are redeemed within approximately three years of the date of issuance.