Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of indefinite-lived intangible assets
Indefinite-Lived Intangible Assets
Carrying Value at December 31,
(in millions)20192018
International routes and slots$2,583  $2,583  
Airline alliances1,005  661  
Delta tradename850  850  
Domestic slots622  622  
Total$5,060  $4,716  
Schedule of definite-lived intangible assets
Definite-Lived Intangible Assets
December 31, 2019December 31, 2018
(in millions)Gross
Carrying
Value		 
Accumulated
Amortization		Gross
Carrying
Value		 
Accumulated
Amortization
Marketing agreements$730  $(692) $730  $(687) 
Contracts193  (128) 193  (122) 
Other53  (53) 53  (53) 
Total$976  $(873) $976  $(862)