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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Operating Revenue by Principal Geographic Region
The Company's operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) for the years ended December 31 is presented in the table below (in millions):
202120202019
Domestic (U.S. and Canada)$16,845 $9,911 $26,960 
Atlantic3,414 2,226 7,387 
Pacific1,507 1,706 5,132 
Latin America2,868 1,512 3,780 
Total$24,634 $15,355 $43,259 
Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):                                                        
Twelve Months Ended
December 31,
20212020
Total Frequent flyer deferred revenue - beginning balance$5,975 $5,276 
Total miles awarded1,545 1,336 
Travel miles redeemed (Passenger revenue)(1,171)(568)
Non-travel miles redeemed (Other operating revenue)(67)(69)
Total Frequent flyer deferred revenue - ending balance$6,282 $5,975 
Reconciliation of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of consolidated cash flows (in millions):
UALUnited
At December 31,At December 31,
202120202019202120202019
Current assets:
Cash and cash equivalents$18,283 $11,269 $2,762 $18,283 $11,269 $2,756 
Restricted cash37 255 — 37 255 — 
Other assets:
Restricted cash213 218 106 213 218 106 
Total cash, cash equivalents and restricted cash shown in the statement of consolidated cash flows$18,533 $11,742 $2,868 $18,533 $11,742 $2,862 
Reconciliation of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of consolidated cash flows (in millions):
UALUnited
At December 31,At December 31,
202120202019202120202019
Current assets:
Cash and cash equivalents$18,283 $11,269 $2,762 $18,283 $11,269 $2,756 
Restricted cash37 255 — 37 255 — 
Other assets:
Restricted cash213 218 106 213 218 106 
Total cash, cash equivalents and restricted cash shown in the statement of consolidated cash flows$18,533 $11,742 $2,868 $18,533 $11,742 $2,862 
Estimated Useful Lives of Property and Equipment The estimated useful lives of property and equipment are as follows:
 Estimated Useful Life (in years)
Aircraft, spare engines and related rotable parts
25 to 30
Aircraft seats
10 to 15
Buildings
25 to 45
Other property and equipment
3 to 15
Computer software
5 to 15
Building improvements
1 to 40
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):
20212020
Gross 
Carrying
Amount		Accumulated
Amortization		Gross 
Carrying
Amount		Accumulated
Amortization
Goodwill$4,527 $4,527 
Indefinite-lived intangible assets
Route authorities$1,020 $1,020 
Airport slots574 560 
Tradenames and logos593 593 
Alliances404 404 
Total$2,591 $2,577 
Finite-lived intangible assets
Frequent flyer database$1,177 $1,008 $1,177 $971 
Hubs145 118 145 111 
Contracts120 120 120 116 
Other314 298 314 297 
Total$1,756 $1,544 $1,756 $1,495