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Leases - Assets and Liabilities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Lessee, Lease, Assets and Liabilities [Line Items]  
Long-term operating lease right-of-use assets, net $ 443
Total lease right-of-use assets 538
Operating leases  
Long-term operating lease liabilities 348
Total operating lease liabilities 451
Finance Leases  
Total finance lease liabilities 56
Total lease liabilities 507
Property and equipment  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, gross 110
Accumulated depreciation  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, accumulated depreciation (15)
Property and equipment, net  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, net 95
Other current liabilities  
Operating leases  
Operating lease liabilities, current 103
Short-term debt  
Finance Leases  
Finance lease liabilities, current 19
Other long-term debt  
Finance Leases  
Finance lease liabilities, noncurrent $ 37