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Leases Lessee Disclosure - Lease Liability Maturity Table (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Lessee Disclosure - Lease Maturity Table [Abstract]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months   $ 165
Lessee, Liability, Payments, Due Next Twelve Months $ 124  
Lessee, Liability, Payments, Due Year Two 162  
Lessee, Liability, Payments, Due Year Three 128  
Lessee, Liability, Payments, Due Year Four 100  
Lessee, Liability, Payments, Due Year Five 70  
Lessee, Liability, Payments, Due after Year Five 154  
Lessee, Liability, Payments, Due 738  
Lease, Liability, Undiscounted Excess Amount 103  
Lease, Liability 635  
Operating Lease Liabilities, Payments Due [Abstract]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 115  
Lessee, Operating Lease, Liability, Payments, Due Year Two 151 144
Lessee, Operating Lease, Liability, Payments, Due Year Three 120 120
Lessee, Operating Lease, Liability, Payments, Due Year Four 95 95
Lessee, Operating Lease, Liability, Payments, Due Year Five 69 79
Lessee, Operating Lease, Liability, Payments, Due after Year Five 154 196
Lessee, Operating Lease, Liability, Payments, Due 704 $ 799
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 101  
Operating Lease, Liability 603  
Finance Lease Liabilities, Payments, Due [Abstract]    
Finance Lease, Liability, Payments, Remainder of Fiscal Year 9  
Finance Lease, Liability, Payments, Due Year Two 11  
Finance Lease, Liability, Payments, Due Year Three 8  
Finance Lease, Liability, Payments, Due Year Four 5  
Finance Lease, Liability, Payments, Due Year Five 1  
Finance Lease, Liability, Payments, Due after Year Five 0  
Finance Lease, Liability, Payments, Due 34  
Finance Lease, Liability, Undiscounted Excess Amount 2  
Finance Lease, Liability $ 32