Revenue Recognition - Revenue by Geographic Region (Details) - USD ($)
$ in Millions |
3 Months Ended |
12 Months Ended |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
$ 11,439
|
$ 12,560
|
$ 12,536
|
$ 10,472
|
$ 10,742
|
$ 11,953
|
$ 11,775
|
$ 9,968
|
$ 47,007
|
$ 44,438
|
$ 41,138
|
| Domestic |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
33,284
|
31,233
|
28,850
|
| Atlantic |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
7,363
|
7,042
|
6,297
|
| Latin America |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
3,343
|
3,181
|
3,133
|
| Pacific |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
3,017
|
2,982
|
2,858
|
| Passenger |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
42,277
|
39,755
|
36,947
|
| Passenger | Domestic |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
30,367
|
28,159
|
26,079
|
| Passenger | Atlantic |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
6,381
|
6,165
|
5,537
|
| Passenger | Latin America |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
3,002
|
2,888
|
2,862
|
| Passenger | Pacific |
|
|
|
|
|
|
|
|
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Operating revenue |
|
|
|
|
|
|
|
|
$ 2,527
|
$ 2,543
|
$ 2,469
|