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Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 52  
Operating lease commitments, not yet commenced 82  
Financing lease commitments 0  
Operating lease commitments 985  
Lease liabilities, noncurrent $ 649 $ 0
Weighted average remaining lease term for operating lease 7 years  
Weighted average operating discount rate used to determine the operating lease 5.00%  
Operating cash flow payments $ 50  
Operating lease, right-of-use asset $ 18  
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease commitments term, not yet commenced 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease commitments term, not yet commenced 25 years