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Commitments, Contingencies and Guarantees - Unrecorded Unconditional Purchase Obligations (Parenthetical) (Detail) - Obligations Related to Aircraft to Be Leased [Member]
$ in Millions
Dec. 31, 2015
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2016 $ 469
2017 414
2018 334
2019 292
2020 235
2021 and Thereafter 704
American Airlines, Inc. [Member]  
Unrecorded Unconditional Purchase Obligation [Line Items]  
2016 469
2017 414
2018 334
2019 292
2020 235
2021 and Thereafter $ 704