Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Information about Goodwill and Other Intangible Assets

The following table presents information about the Company's goodwill and other intangible assets at December 31 (in millions):

	2018				2017
Item	Gross  Carrying Amount		Accumulated Amortization		Gross  Carrying Amount		Accumulated Amortization
Goodwill	$	4,523			$	4,523
Finite-lived intangible assets
Frequent flyer database	$	1,177	$	884	$	1,177	$	832
Hubs	145		97		145		89
Contracts	120		106		121		103
Patents and tradenames	108		108		108		108
Airport slots and gates	97		97		97		97
Other	109		88		109		84
Total	$	1,756	$	1,380	$	1,757	$	1,313
Indefinite-lived intangible assets
Route authorities	$	1,240			$	1,562
Airport slots and gates	546				536
Tradenames and logos	593				593
Alliances	404				404
Total	$	2,783			$	3,095