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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021
 TotalLevel 1Level 2Level 3
Short-term investments (1), (2):
Money market funds$6,662 $6,662 $— $— 
Corporate obligations4,123 — 4,123 — 
Bank notes/certificates of deposit/time deposits2,257 — 2,257 — 
Repurchase agreements720 — 720 — 
13,762 6,662 7,100 — 
Restricted cash and short-term investments (1), (3)
806 606 200 — 
Long-term investments (4)
201 201 — — 
Total$14,769 $7,469 $7,300 $— 
(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 mature in one year or less.
(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 as well as collateral associated with the payment of certain fees and interest in respect of the AAdvantage Financing 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 condensed consolidated balance sheet.
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): 
 March 31, 2021December 31, 2020
 Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Long-term debt, including current maturities$39,124 $40,325 $32,021 $30,454 
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 March 31, 2021
 TotalLevel 1Level 2Level 3
Short-term investments (1), (2):
Money market funds$6,648 $6,648 $— $— 
Corporate obligations4,123 — 4,123 — 
Bank notes/certificates of deposit/time deposits2,257 — 2,257 — 
Repurchase agreements720 — 720 — 
13,748 6,648 7,100 — 
Restricted cash and short-term investments (1), (3)
806 606 200 — 
Long-term investments (4)
201 201 — — 
Total$14,755 $7,455 $7,300 $— 
(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 mature in one year or less.
(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 as well as collateral associated with the payment of certain fees and interest in respect of the AAdvantage Financing 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 condensed consolidated balance sheet.
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): 
 March 31, 2021December 31, 2020
 Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Long-term debt, including current maturities$34,225 $35,328 $28,410 $27,193