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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, 2018
Dec. 31, 2017
Pension Benefits [Member]    
Change in fair value measurements of level 3 investments    
Fair value of plan assets at beginning of period $ 11,395 $ 10,017
Actual loss on plan assets:    
Fair value of plan assets at end of period 10,053 11,395
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 14 21
Actual loss on plan assets:    
Relating to assets still held at the reporting date (2) (4)
Purchases 1 1
Sales (6) (1)
Transfers out   (3)
Fair value of plan assets at end of period 7 14
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 0
Purchases 0 0
Sales 0 0
Transfers out   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 14 21
Actual loss on plan assets:    
Relating to assets still held at the reporting date (2) (4)
Purchases 1 1
Sales (6) (1)
Transfers out   (3)
Fair value of plan assets at end of period 7 14
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 0
Purchases 0 0
Sales 0 0
Transfers out   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 11,340 9,968
Actual loss on plan assets:    
Fair value of plan assets at end of period $ 10,001 $ 11,340