XML 63 R43.htm IDEA: XBRL DOCUMENT 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