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Leases - Assets and Liabilities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Lessee, Lease, Assets and Liabilities [Line Items]  
Long-term operating lease right-of-use assets, net $ 477
Total lease right-of-use assets 569
Operating leases  
Long-term operating lease liabilities 383
Total operating lease liabilities 487
Finance Leases  
Total finance lease liabilities 55
Total lease liabilities 542
Property and equipment  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, gross 109
Accumulated depreciation  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, accumulated depreciation (17)
Property and equipment, net  
Lessee, Lease, Assets and Liabilities [Line Items]  
Finance lease right-of-use assets, net 92
Other current liabilities  
Operating leases  
Operating lease liabilities, current 104
Short-term debt  
Finance Leases  
Finance lease liabilities, current 19
Other long-term debt  
Finance Leases  
Finance lease liabilities, noncurrent $ 36