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Leases - Assets and Liabilities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Lessee, Lease, Assets and Liabilities [Line Items]  
Long-term operating lease right-of-use assets, net $ 466
Total lease right-of-use assets 574
Operating lease liabilities  
Long-term operating lease liabilities 387
Total operating lease liabilities 481
Finance lease liabilities  
Total finance lease liabilities 67
Total lease liabilities 548
Equity Method Investees  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, net 12
Finance lease liabilities  
Total finance lease liabilities 12
Property and equipment  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, gross 124
Accumulated depreciation  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, accumulated depreciation (16)
Property and equipment, net  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, net 108
Other current liabilities  
Operating lease liabilities  
Operating lease liabilities, current 94
Short-term debt  
Finance lease liabilities  
Finance lease liabilities, current 18
Other long-term debt  
Finance lease liabilities  
Finance lease liabilities, noncurrent $ 49