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Loans Payable, Long-Term Debt and Leases Loans Payable, Long-Term Debt and Leases - Operating Leases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Jul. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Weighted-average remaining lease term (in years) 7 years 6 months    
Operating lease cost $ 83    
Cash payments included in the measurement of operating lease liabilities 73    
Obligations associated with operating leases not yet commenced $ 110    
Term for operating lease not yet commenced (in years) 10 years    
2019     $ 188
2020     198
2021     150
2022     134
2023     84
Thereafter     $ 243
Facilities      
Lessee, Lease, Description [Line Items]      
Weighted-average remaining lease term (in years) 8 years    
Renewal term (in years) 4 years    
Vehicle      
Lessee, Lease, Description [Line Items]      
Average remaining lease term (in years) 4 years    
Forecast      
Lessee, Lease, Description [Line Items]      
Obligations associated with operating leases not yet commenced   $ 72