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Fair Value Measurements and Other Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Summary of Assets Measured at Fair Value on Recurring Basis
Assets measured at fair value on a recurring basis are summarized below (in millions):
 Fair Value Measurements as of December 31, 2020
 Total    Level 1    Level 2    Level 3    
Short-term investments (1), (2):
Money market funds$247 $247 $— $— 
Corporate obligations3,449 — 3,449 — 
Bank notes/certificates of deposit/time deposits2,168 — 2,168 — 
Repurchase agreements755 — 755 — 
6,619 247 6,372 — 
Restricted cash and short-term investments (1), (3)
609 448 161 — 
Long-term investments (4)
161 161 — — 
Total$7,389 $856 $6,533 $— 
 Fair Value Measurements as of December 31, 2019
 Total    Level 1    Level 2    Level 3    
Short-term investments (1):
Money market funds$333 $333 $— $— 
Bank notes/certificates of deposit/time deposits2,107 — 2,107 — 
Corporate obligations1,021 — 1,021 — 
Repurchase agreements85 — 85 — 
3,546 333 3,213 — 
Restricted cash and short-term investments (1)
158 10 148 — 
Long-term investments (4)
204 204 — — 
Total$3,908 $547 $3,361 $— 
(1)All short-term investments are classified as available-for-sale and stated at fair value. Unrealized gains and losses are recorded in accumulated other comprehensive loss at each reporting period. There were no credit losses.
(2)Our short-term investments as of December 31, 2020 mature in one year or less except for $235 million of bank notes/certificates of deposit/time deposits.
(3)Restricted cash and short-term investments primarily include money market funds to be used to finance a substantial portion of the cost of the renovation and expansion of Terminal 8 at JFK and collateral held to support workers' compensation obligations.
(4)Long-term investments primarily include our equity investment in China Southern Airlines, in which we presently own a 1.8% equity interest, and are classified in other assets on the consolidated balance sheets.
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities
The carrying value and estimated fair value of our long-term debt, including current maturities, were as follows (in millions):
 December 31, 2020December 31, 2019
 Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Long-term debt, including current maturities$32,021 $30,454 $23,645 $24,508 
American Airlines, Inc.  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Summary of Assets Measured at Fair Value on Recurring Basis
Assets measured at fair value on a recurring basis are summarized below (in millions):
 Fair Value Measurements as of December 31, 2020
 TotalLevel 1Level 2Level 3
Short-term investments (1), (2):
Money market funds$245 $245 $— $— 
Corporate obligations3,449 — 3,449 — 
Bank notes/certificates of deposit/time deposits2,168 — 2,168 — 
Repurchase agreements755 — 755 — 
6,617 245 6,372 — 
Restricted cash and short-term investments (1), (3)
609 448 161 — 
Long-term investments (4)
161 161 — — 
Total$7,387 $854 $6,533 $— 
 Fair Value Measurements as of December 31, 2019
 TotalLevel 1Level 2Level 3
Short-term investments (1):
Money market funds$331 $331 $— $— 
Bank notes/certificates of deposit/time deposits2,106 — 2,106 — 
Corporate obligations1,021 — 1,021 — 
Repurchase agreements85 — 85 — 
3,543 331 3,212 — 
Restricted cash and short-term investments (1)
158 10 148 — 
Long-term investments (4)
204 204 — — 
Total$3,905 $545 $3,360 $— 
(1)All short-term investments are classified as available-for-sale and stated at fair value. Unrealized gains and losses are recorded in accumulated other comprehensive loss at each reporting period. There were no credit losses.
(2)American’s short-term investments as of December 31, 2020 mature in one year or less except for $235 million of bank notes/certificates of deposit/time deposits.
(3)Restricted cash and short-term investments primarily include money market funds to be used to finance a substantial portion of the cost of the renovation and expansion of Terminal 8 at JFK and collateral held to support workers' compensation obligations.
(4)Long-term investments primarily include American's equity investment in China Southern Airlines, in which American presently owns a 1.8% equity interest, and are classified in other assets on the consolidated balance sheets.
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities
The carrying value and estimated fair value of American’s long-term debt, including current maturities, were as follows (in millions):
 December 31, 2020December 31, 2019
 Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Long-term debt, including current maturities$28,410 $27,193 $22,372 $23,196