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Rental Income under Operating Leases (Property Available for Lease) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Land [Member]    
Operating Leased Assets [Line Items]    
Total property and equipment $ 354 $ 303
Building and Building Improvements [Member]    
Operating Leased Assets [Line Items]    
Total property and equipment 254 224
Equipment [Member]    
Operating Leased Assets [Line Items]    
Total property and equipment 53 137
Property and Equipment, Net [Member]    
Operating Leased Assets [Line Items]    
Total property and equipment 661 664
Accumulated depreciation (90) (121)
Property and equipment, net $ 571 $ 543