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Leases Lessee Disclosure - Lease Liability Maturity Table - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Lessee Disclosure - Lease Maturity Table [Abstract]    
Lessee, Liability, Payments, Remainder of Fiscal Year $ 33  
Lessee, Liability, Payments, Due Year Two 174  
Lessee, Liability, Payments, Due Year Three 145  
Lessee, Liability, Payments, Due Year Four 115  
Lessee, Liability, Payments, Due Year Five 85  
Lessee, Liability, Payments, Due after Year Five 181  
Lessee, Liability, Payments, Due 733  
Lease, Liability, Undiscounted Excess Amount 101  
Lease, Liability 632  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 30  
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months   $ 165
Lessee, Operating Lease, Liability, Payments, Due Year Two 162 144
Lessee, Operating Lease, Liability, Payments, Due Year Three 135 120
Lessee, Operating Lease, Liability, Payments, Due Year Four 109 95
Lessee, Operating Lease, Liability, Payments, Due Year Five 82 79
Lessee, Operating Lease, Liability, Payments, Due after Year Five 181 196
Lessee, Operating Lease, Liability, Payments, Due 699 $ 799
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 99  
Operating Lease, Liability 600  
Finance Lease, Liability, Payment, Due [Abstract]    
Finance Lease, Liability, Payments, Remainder of Fiscal Year 3  
Finance Lease, Liability, Payments, Due Year Two 12  
Finance Lease, Liability, Payments, Due Year Three 10  
Finance Lease, Liability, Payments, Due Year Four 6  
Finance Lease, Liability, Payments, Due Year Five 3  
Finance Lease, Liability, Payments, Due after Year Five 0  
Finance Lease, Liability, Payment, Due 34  
Finance Lease, Liability, Undiscounted Excess Amount 2  
Finance Lease, Liability $ 32