Subsequent Events - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Apr. 26, 2018 USD ($) Aircraft $ / shares	Mar. 31, 2018 USD ($) $ / shares	Mar. 31, 2017 $ / shares
Subsequent Event [Line Items]
Stock repurchase programs, authorized amount | $		$ 11,000,000,000
Common stock dividends per share declared (in dollars per share) | $ / shares		$ 0.1	$ 0.1
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock repurchase programs, authorized amount | $	$ 2,000,000,000.0
Common stock dividends per share declared (in dollars per share) | $ / shares	$ 0.10
Subsequent Event [Member] | 787 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft acquired	47
Subsequent Event [Member] | 787 Aircraft [Member] | 2026 and 2027 Purchase Option Period [Member]
Subsequent Event [Line Items]
Number of aircraft, option to acquire	14
Subsequent Event [Member] | 787 Aircraft [Member] | 2027 and 2028 Purchase Option Period [Member]
Subsequent Event [Line Items]
Number of aircraft, option to acquire	14
Subsequent Event [Member] | 787-8 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft acquired	22
Subsequent Event [Member] | 787-9 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft acquired	25
Subsequent Event [Member] | MAX 737 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft, deferral of delivery	40
Subsequent Event [Member] | A-350 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft, termination of order	22
American Airlines, Inc. [Member] | Subsequent Event [Member] | 787 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft acquired	47
American Airlines, Inc. [Member] | Subsequent Event [Member] | 787 Aircraft [Member] | 2026 and 2027 Purchase Option Period [Member]
Subsequent Event [Line Items]
Number of aircraft, option to acquire	14
American Airlines, Inc. [Member] | Subsequent Event [Member] | 787 Aircraft [Member] | 2027 and 2028 Purchase Option Period [Member]
Subsequent Event [Line Items]
Number of aircraft, option to acquire	14
American Airlines, Inc. [Member] | Subsequent Event [Member] | 787-8 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft acquired	22
American Airlines, Inc. [Member] | Subsequent Event [Member] | 787-9 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft acquired	25
American Airlines, Inc. [Member] | Subsequent Event [Member] | MAX 737 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft, deferral of delivery	40
American Airlines, Inc. [Member] | Subsequent Event [Member] | A-350 Aircraft [Member]
Subsequent Event [Line Items]
Number of aircraft, termination of order	22