XML 54 R32.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]        
Passenger travel $ 1,322 $ 145 $ 1,945 $ 1,553
Loyalty revenue - air transportation 66 25 113 129
Loyalty revenue 81 38 126 88
Other revenue 30 7 48 33
Total revenue $ 1,499 $ 215 $ 2,232 $ 1,803