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Leases - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Lessee, Lease, Description [Line Items]          
Operating lease, right-of-use asset   $ 433 $ 539    
Operating leases, liability   $ 433 538    
Renewal term   99 years      
Termination period   30 days      
Estimated construction cost, noncancellable lease $ 550        
Residual value guarantee, percentage 90.00%        
Right-of-use assets obtained in exchange for new operating lease liabilities   $ 22 49    
Operating cash flows from operating leases   $ 109 114    
Proceeds from sale of leaseback transactions     82    
Sale and leaseback transaction, gain (loss)     $ 15    
Minimum rents       $ 102  
Contingent rents       $ 102  
Accounting Standards Update 2016-02          
Lessee, Lease, Description [Line Items]          
Operating lease, right-of-use asset         $ 586
Operating leases, liability         $ 586
Equipment | Minimum          
Lessee, Lease, Description [Line Items]          
Remaining lease term   1 year      
Equipment | Maximum          
Lessee, Lease, Description [Line Items]          
Remaining lease term   5 years      
Line of Road and Property Lease | Minimum          
Lessee, Lease, Description [Line Items]          
Remaining lease term   1 year      
Line of Road and Property Lease | Maximum          
Lessee, Lease, Description [Line Items]          
Remaining lease term   137 years      
Building          
Lessee, Lease, Description [Line Items]          
Lease not yet commenced, term of contract   5 years