Annual report pursuant to Section 13 and 15(d)

Leases - Remaining Lease Term And Lease Expense (Details)

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Leases - Remaining Lease Term And Lease Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Leases        
Lease, Practical Expedients, Package [true false] true      
Lease, Practical Expedient, Use of Hindsight [true false] false      
Operating lease ROU assets (1) $ 397      
Short term operating lease liabilities 64      
Long term operating lease liabilities $ 349      
Deferred Rent       $ 23
Operating lease, existence of option to extend true      
Finance lease, existence of option to extend true      
Operating lease, existence of option to terminate true      
Finance lease, existence of option to terminate true      
Components of lease expense:        
Operating Lease Cost $ 78      
Finance lease cost        
Depreciation of leased assets 20      
Interest on lease liabilities 9      
Total finance lease cost $ 29      
Rent expense   $ 80 $ 45  
Minimum        
Leases        
Operating lease, remaining lease term 1 year      
Finance lease, remaining lease term 1 year      
Maximum        
Leases        
Operating lease, remaining lease term 15 years      
Finance lease, remaining lease term 15 years      
Operating lease, option to extend, period 14 years      
Finance lease, option to extend, period 14 years      
Operating lease, terminate term 1 year      
Finance lease, terminate term 1 year      
Adjustments        
Leases        
Operating lease ROU assets (1)       287
Short term operating lease liabilities       51
Long term operating lease liabilities       $ 259