Contingencies - Antitrust Litigation and Investigations (Details) - USD ($) |
1 Months Ended | 3 Months Ended | ||||
---|---|---|---|---|---|---|
Apr. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Nov. 30, 2017 |
|
Loss Contingencies [Line Items] | ||||||
Percentage of bookings affected (fraction of) | 1.00% | |||||
Value added tax receivable | $ 23,000,000 | |||||
Foreign Tax Authority | Indian Income Tax Litigation | ||||||
Loss Contingencies [Line Items] | ||||||
Estimated loss | 44,000,000 | |||||
US Airways Litigation | ||||||
Loss Contingencies [Line Items] | ||||||
Damages awarded | $ 15,000,000 | $ 15,000,000 | ||||
Loss contingency accrual | $ 32,000,000 | $ 0 | ||||
Reasonable attorneys' fees, expenses and costs | 17,000,000 | |||||
Loss contingency reversal | $ 32,000,000 | |||||
US Airways Litigation | US Airways | ||||||
Loss Contingencies [Line Items] | ||||||
Damages awarded | 15,000,000 | $ 5,000,000 | ||||
Attorneys' fees and costs sought | $ 125,000,000 |