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Employee Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period $ 10,053 $ 11,395
Actual loss on plan assets:    
Fair value of plan assets at end of period 12,897 10,053
Pension Benefits [Member] | Level 3 [Member] | Private market partnerships [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period 7 14
Actual loss on plan assets:    
Relating to assets still held at the reporting date   (2)
Purchases 3 1
Sales   (6)
Fair value of plan assets at end of period 10 7
Pension Benefits [Member] | Level 3 [Member] | Insurance group annuity contracts [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period 2 2
Actual loss on plan assets:    
Relating to assets still held at the reporting date   0
Purchases 0 0
Sales   0
Fair value of plan assets at end of period 2 2
American Airlines, Inc. [Member] | Level 3 [Member] | Private market partnerships [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period 7 14
Actual loss on plan assets:    
Relating to assets still held at the reporting date   (2)
Purchases 3 1
Sales   (6)
Fair value of plan assets at end of period 10 7
American Airlines, Inc. [Member] | Level 3 [Member] | Insurance group annuity contracts [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period 2 2
Actual loss on plan assets:    
Relating to assets still held at the reporting date   0
Purchases 0 0
Sales   0
Fair value of plan assets at end of period 2 2
American Airlines, Inc. [Member] | Pension Benefits [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period 10,001 11,340
Actual loss on plan assets:    
Fair value of plan assets at end of period $ 12,829 $ 10,001