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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) | $ 0 | $ 0 | $ 0
Finite-Lived Intangible Assets [Line Items] |  |  |
Assets Constructed for Others Recognized Prior to the Adoption of ASC 842 Leases |  | 561 |
Construction Obligation Recognized Prior to the Adoption of ASC 842 Leases |  | 424 |
Schedule of AFS and HTM Securities [Line Items] |  |  |
Available-for-sale securities | 351 | 236 |
Debt Securities, Available-for-sale | 6 | 7 |
Debt Securities, Held-to-maturity | 21 | 180 |
Total investment securities | 372 | 416 |
High Density Airports, Take-Off and Landing Slots [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Net (Excluding Goodwill) | 139 |  |
Bank Time Deposits [Member] |  |  |
Schedule of AFS and HTM Securities [Line Items] |  |  |
Available-for-sale securities | 325 | 190 |
Commercial Paper [Member] |  |  |
Schedule of AFS and HTM Securities [Line Items] |  |  |
Available-for-sale securities | 20 | 0 |
US Treasury Securities [Member] |  |  |
Schedule of AFS and HTM Securities [Line Items] |  |  |
Available-for-sale securities | 0 | 39 |
Debt Securities, Held-to-maturity | 0 | 180 |
Corporate Bond Securities [Member] |  |  |
Schedule of AFS and HTM Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | $ 21 | $ 0 |

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- Definition The total gross costs incurred by a lessee (the company) for physical assets and the costs to assemble them on property that is subject to a ground lease. The lessee is considered the owner of these assets for financial reporting purposes, even though some or all of these costs may have been reimbursed by the lesser but the criteria to qualify for sale-leaseback accounting treatment were not satisfied. + References No definition available. + Details
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- Definition The liability related to the reimbursement by the lesser of costs associated with assets constructed for others (physical assets and the costs to assemble them on property that is subject to a ground lease). + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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