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Leases Lessee Disclosure - Lease Liability Maturity Table (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Lessee Disclosure - Lease Maturity Table [Abstract]    
Lessee, Liability, Payments, Due Next Twelve Months $ 83  
Lessee, Liability, Payments, Due Year Two 167  
Lessee, Liability, Payments, Due Year Three 135  
Lessee, Liability, Payments, Due Year Four 106  
Lessee, Liability, Payments, Due Year Five 76  
Lessee, Liability, Payments, Due after Year Five 163  
Lessee, Liability, Payments, Due 730  
Lease, Liability, Undiscounted Excess Amount 101  
Lease, Liability 629  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 77  
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months   $ 165
Lessee, Operating Lease, Liability, Payments, Due Year Two 156 144
Lessee, Operating Lease, Liability, Payments, Due Year Three 126 120
Lessee, Operating Lease, Liability, Payments, Due Year Four 100 95
Lessee, Operating Lease, Liability, Payments, Due Year Five 74 79
Lessee, Operating Lease, Liability, Payments, Due after Year Five 162 196
Lessee, Operating Lease, Liability, Payments, Due 695 $ 799
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 99  
Operating Lease, Liability 596  
Finance Lease, Liability, Payment, Due [Abstract]    
Finance Lease, Liability, Payments, Remainder of Fiscal Year 6  
Finance Lease, Liability, Payments, Due Year Two 11  
Finance Lease, Liability, Payments, Due Year Three 9  
Finance Lease, Liability, Payments, Due Year Four 6  
Finance Lease, Liability, Payments, Due Year Five 2  
Finance Lease, Liability, Payments, Due after Year Five 1  
Finance Lease, Liability, Payment, Due 35  
Finance Lease, Liability, Undiscounted Excess Amount 2  
Finance Lease, Liability $ 33