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Leases Lessee Disclosure - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee Disclosure [Abstract]      
Operating lease assets, net $ 515 $ 525 $ 0
Property and equipment, net [1] 41    
Total lease assets, net 556    
Current portion of operating lease liabilities 122 126 0
Current portion of finance/capital lease liabilities 13   12
Long-term operating lease liabilities 467 $ 458 $ 0
Non-current portion of finance lease liabilities 22    
Total lease liabilities $ 624    
Operating Lease, Weighted Average Remaining Lease Term 6 years 1 month 6 days    
Finance Lease, Weighted Average Remaining Lease Term 3 years 1 month 6 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.10%    
Finance Lease, Weighted Average Discount Rate, Percent 4.10%    
Finance lease asset, accumulated depreciation $ (34)    
[1] Finance lease assets are recorded net of accumulated amortization of $34 million.