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Revenue - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Percent of ETCs and FFCs with expiration dates extending beyond 12 months |  |  | 90.00% |  | 90.00% |
Operating revenue |  |  | $ 2,489 | $ 11,380 | $ 11,943 | $ 32,371
Advance Ticket Sales |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Expiration period for ETCs | 24 months | 12 months |  |  |  |
Expiration period for FFCs | 24 months |  |  |  |  |
ETC and FFC liabilities |  |  | 3,000 |  | 3,000 |
Revenue recognized |  |  | 500 | 4,100 | 2,900 | 3,400
Ancillary Fees |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Operating revenue |  |  | 157 | 645 | 699 | 1,900
Other Operating Revenue |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Operating revenue |  |  | 418 | 617 | 1,460 | 1,816
Other Operating Revenue | Chase and Other Partner Agreements |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |
Operating revenue |  |  | $ 378 | $ 489 | $ 1,200 | $ 1,500

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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